The given sentence is grammatically incorrect and error lies in option B. ‘Indoor’ is an adjective which means located, or taking place within a building. But, after the verb ‘spent’ (second form of verb spend), we need an adverb that modifies it and not an adjective. Thus, replace adjective ‘indoor’ with the adverb ‘indoors’ (which means within a building).

Option B has the grammatically incorrect part. The phrasal verb “cut off” means the act of stopping the supply of something which doesn’t give a proper sense to the sentence. Replace it with “cut down” which means to use less of something.

Option C has the grammatically incorrect part. In this sentence, Tea is compared with other beverages. The phrase “any beverage” includes “tea” in its group too which cannot be the case. Hence, add “other” after “any” to make the sentence grammatically correct.

Option D has the grammatically incorrect part. After the verb “suggested” we use V+ing form. Hence, replace “to travel” with “travelling”.

Have/has + verb (IIIrd form)

Hence, option A is the correct answer.

Hence, option B is the correct answer.

 Option A has the grammatically incorrect part. The sentence has the conjunction “since” and is followed by a simple past tense. Therefore, the first part should be in the present perfect continuous tense. Replace “was watching” with “have been watching” to make the sentence grammatically correct.

 Option B has the grammatically incorrect part. We need to add ‘to’ between as and help. The idiomatic phrase “so as to” means in order to perform some kind of action that will have an effect on object or person. Hence, add “to” between ‘as’ and ‘help’.

 Option D has the grammatically incorrect part. We need an adjective here and not an adverb. Therefore, replace “reliably” with “reliable” in order to make the sentence grammatically correct.

Option D has the grammatically incorrect part. ‘Is’ should be replaced with ‘are’ because our subject 'people' is plural, so a plural helping verb should be used i.e. ‘are’. Hence, option D is the correct answer.