As a Wave Moves to the Right in an Elastic

Multiple Choice

As a wave moves to the right in an elastic rope,a sequence of pictures (1 through 6) is taken at intervals of one second.An arrow points out a particle that is attached to the rope.If the width of the picture is 8 cm,this wave has a period of

A) 0.2 s
B) 10 s
C) 3 s
D) 6 s
E) 12 s