The given sentence is grammatically incorrect and an error lies in option D. Here, the pattern i.e. “as + adjective + as + if not + comparative degree + than” will be used. As, ‘wisest’ is a superlative degree, so it must be replaced with comparative degree i.e. ‘wiser’.

 Option B has the grammatically incorrect part. When the sentence starts with a “only + adverb of manner”, we use inversion, i.e. verb before the subject. Therefore, put “did” before the pronoun “it” to make the sentence grammatically correct.

The given sentence is grammatically incorrect and an error lies in option B. Here, conjunction 'such as' has been used wrongly. 'Such as' means something used as an example. It should be replaced by 'so as' which indicates a purpose and here to get a good view is the only purpose to climb up a tree. Thus, 'such as' should be replaced with 'so as'.

The given sentence is grammatically incorrect and an error lies in option D. Here, the use of the conjunction 'but' is incorrect. 'But' introduces something in contrast or unexpected or something on the contrary. In the given sentence, "they could not see the film" is the 'reason' for telling them something. So, a conjunction with the similar meaning should be used. The most appropriate to use would be 'as' which means for the reason that or on account of. Thus, 'but' will be replaced by 'as'.

The given sentence is grammatically incorrect and an error lies in option C. Here, the preposition 'under' has been wrongly used. 'Under' means at a position directly lower than (with the subject just above). 'Under' should be replaced by the preposition 'with' which means to accompany i.e. with the help of his mom, he/she is able to finish the lunch quickly. 

The given sentence is grammatically incorrect and an error lies in option C. Here, a verb should be used despite using a noun i.e. 'herd' which means a group of cattle, sheep or other domestic mammals all of the same kind that are herded by humans. 'Herd' should be replaced by the verb 'heard' i.e. past participle of verb hear which means be told or informed of.

Option A has the grammatically incorrect part. The given sentence is an interrogative sentence. We generally use “some” in assertive sentences and “any” in interrogative sentences. Hence, to make the sentence grammatically correct replace “some” with “any”.

Option B has the grammatically incorrect part. “Inefficiency” is a noun, whereas we need an adjective here for the noun administration. Hence, replace “inefficiency” with “inefficient”.

The given sentence has no error. It is grammatically correct.

Whom is used to refer to the object of a verb or preposition. Hence, who must be replaced with whom to form a grammatically correct sentence.

Hence, option C is the correct answer.