Answer:
A. is studying
Jane is studying lae at Harvard for four years now
Jane has been studying law at Harvard for four years now.
The present perfect continuous tense is used in the above sentence. It is used because it shows that an action started in the past but it is continuing till date. Jane started studying at Harvard four years ago and is still studying.
This tense denotes about the action which commenced in past and is still continuing in the present. "Has/have been" is used in this tense.
Harvard University is a private University in Cambridge. Earlier it was named as Harvard College.
Hence, option B is correct.
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