Two Identical Strings Have the Same Length and Same Mass

Multiple Choice

Two identical strings have the same length and same mass per unit length. String B is stretched with four times as great a tension as that applied to string A. Which statement is correct for all n harmonics on the two strings, n = 1, 2, 3...?

A) .
B) .
C) .
D) fn,B = 2fn,A.
E) fn,B = 4fn,A.