The correct answer is: D. One of
The word “one of” is used to refer to a member of a group. In this case, the group is “us”, which refers to the people who are taking the test. The question is asking which of the people taking the test know computer operating. The answer “one of” is correct because it indicates that there is at least one person taking the test who knows computer operating.
The other options are incorrect because they do not indicate that there is at least one person taking the test who knows computer operating. Option A, “a little”, indicates that only a small amount of people taking the test know computer operating. Option B, “Jayesh”, indicates that only one specific person taking the test knows computer operating. Option C, “a few”, indicates that there are a few people taking the test who know computer operating, but it does not specify how many.