Three Separate Strings Are Made of the Same Material $\tau$

Multiple Choice

Three separate strings are made of the same material. String 1 has length L and tension $\tau$ , string 2 has length 2L and tension 2 $\tau$ and string 3 has length 3L and tension 3 $\tau$ . A pulse is started at one end of each string. If the pulses start at the same time, the order in which they reach the other end is:

A) 1, 2, 3
B) 3, 2, 1
C) 2, 3, 1
D) 3, 1, 2
E) they all take the same time