The spring constant of the spring is approximately which of the following?

(A) 100 N/m

(B) 10 N/m

(C) 1.0 N/m

(D) 0.1 N/m

Refer to the following material.

The figure above shows a pole with a spring around it and a 0.10 kg block with a hole in the middle on top of the spring. A light horizontal string is attached to the block and wall. When the block is oscillating at 5.0 Hz, the standing wave shown is formed.