. . . . . know computer operating among us.

Answer: Option C

The correct sentence is: "A few know computer operating among us."

The phrase "A few" is used with countable nouns and means a small number of people in this context. Since "people" is implied in the sentence, this choice correctly quantifies the number of people who know computer operating.

Option A: "A little" is incorrect because it is used with uncountable nouns, not countable ones like "people."

Option B: "Jayesh" is a name and not a quantifier, making it incorrect.

Option D: "One of" is grammatically correct but refers to a single person within a group, which does not match the intended meaning of multiple people knowing computer operating.

Thus, the best choice is Option C: A few.