Unless (1)/ you will study hard (2)/ you cannot pass. (3)/ No error (4)

Options

A. 1 Unless
B. 2 you will study hard
C. 3 you cannot pass.
D. 4 No error

Answer

2

Explanation

will will not be used.
Unless means the same as if - not
Look at the examples given below :
You will be sick if you don.t stop eating .
You.ll be sick unless you stop eating .
Parallel Verbs are not used in the Conditional Caluses
Hence, you study hard is the right usage.