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Math Multiple Choice

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The table shows some values for X and Y, where C and D are nonzero constants. If X is directly proportional to Y, what is D in terms of C?

A 4C
B $\mathbf{3.5c}$
C $\frac{4}{c}$
D $\frac{16}{c}$
E $\frac{1}{c}$

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X increased from 4 to 16, in other words by 4 times. Thus, the proportional increase in Y, in this case D, must be 4C. D = 4C.