In this question, three options are unnecessarily wordy and confusing. Option (C) here uses the phrase ‘are better in quality’ instead of a more appropriate ‘are of better quality’ as used in Option (B). Option (A) and (D) are unnecessarily verbose. Hence, Option (B) is the right choice.

'Whenever' implies the sentiment ‘at any time’. ‘When’, on the other hand, implies a specific time. Given the intended meaning, option (C) is a better choice than option (D).

According to the question, as the first part of the sentence provides the reason for his being unwilling to testify, ‘because’ should be used to introduce it. Moreover, a comma should always be used to separate two distinct phrases in a sentence. Hence, option (B) is the right answer choice.

This is a question based on idiomatic usage. The appropriate idiomatic use is ‘definition should agree with’. A simpler way to solve this question is to identify how the other choices seem to indulge in unnecessary usage of words. The primary meaning of the sentence is conveyed in the most concise manner by option (C).

In the question, there are two things that need to be kept in mind: 1. Unanticipated and unexpected mean the same, and hence to remove redundancy, we eliminate one out of these two words. 2. Out of consequences and implications, we select consequences as it reflects an outcome of a situation, whereas an implication can refer to an inference also. This makes consequence a better word choice in the given context.