Look, many students . . . . . kites. A. are fly B. are flown C. are flying D. are being flown

are fly
are flown
are flying
are being flown

The correct answer is C. are flying.

The sentence “Look, many students are flying kites” is in the present continuous tense. This tense is used to describe actions that are happening at the moment of speaking. In this case, the students are flying kites right now.

The other options are incorrect because they are not in the present continuous tense. Option A, are fly, is in the simple present tense. This tense is used to describe actions that happen regularly or habitually. Option B, are flown, is in the passive voice. This tense is used to describe actions that are done to someone or something, rather than by someone or something. Option D, are being flown, is also in the passive voice.

In conclusion, the correct answer is C. are flying.