Hence, option B is the correct answer.

The conjunction 'unless' meaning 'except if (used to introduce the case in which a statement being made is not true or valid)' is the apt fit for the blank.

Hence, option a is the correct answer.

Therefore, option b is the correct answer.

Hence, option c is the correct answer.

Averse = strongly disliking or opposed to

Adverse = having a negative or harmful effect on something

Traverse = to move or travel through an area

Inverse = opposite in relation to something else

The blank needs an adjective for the noun “weather conditions”. This eliminates option C ‘traverse’ as it is a verb. Winter has led people to remain indoors. This can happen only when the conditions outdoor are not that good for people to go out. Thus, the word ‘adverse’ is the best fit for the blank. Hence, option B is the correct answer.

Therefore, option c is the correct answer.

Accumulate = to collect a large number of things over a long period of time

Stimulate = to encourage something to grow, develop, or become active

Formulate = to develop all the details of a plan for doing something

Simulate = to do or make something that looks real but is not real

The sentence is about how credit cards encourages a person to shop which leads to debt. The only word that fits in the blank contextually is ‘accumulate’. Hence, option A is the correct answer.

Hence, option A is the correct answer.

Over: on top of and covering

Into: expresses motion to a point on, or within, something

About: with regard or relation to; on the subject of

Under: at a position directly lower than (with the subject just above)

In the above case, the area was in the surveillance, i.e.careful watching especially by the police or army, because of a crime that has happened or is expected.

Hence, option D is the correct answer.

Confined: Prevent from leaving or from being removed

Isolated: Remote and separate physically or socially

Divided: Separated into parts or pieces

Engaged: Having one's attention, mind or energy occupied

In the given sentence, due to heavy snowfall various villages lost connection (physically and socially) with other villages (as it is not easy to commute in snowfall). So, “isolated” is the appropriate word here.

Hence, option B is the correct answer.