I Am Having Problems With This Mechanical Engineering Design Question Any Help?

A compression spring is made of 0.125-in steel wire, for which the shear stiffness G is 11.4 Msi, and shear yield stress Ssy is 85 ksi. It has closed and ground ends (i.e. 2 end coils). The coil’s outer diameter is 1.25 in, and it has 11.25 total coils. If the spring has a
free length Lo = 2.9 in, what is the safety factor against yield when the spring is compressed solid?
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O 13
0 4.8
0 21
O 0.84
None of the aboveMechanical Engineering