After giving 1 mark to each question,7 marks to be distributed among 3 question.
The required number of ways =The number of non-negative integral solution of x+y+z=7
$\Rightarrow 9C_7=9C_2$
$9C_2=\large\frac{9!}{2!7!}=\frac{9\times 8\times 7!}{2\times 7!}$
$\Rightarrow 36$
Hence (C) is the correct answer.