From statement 1 , we can find out D.

75 percentage of D is 30.

0.75*D= 30

D =40.

This statement does not give any information about C.so it is not sufficient to give ratio of C/D required for

calculating percentage.

Statement 2 , c + 15 = d

Dividing each side by D , we get

c/d +15/d =1

We need value of D to solve this equation and get C/D ratio.

This statement is also insufficient.

By putting Value of D from Statement1 into statement 2, we can get both value of C and Value of C/D ratio.

So answer is C

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