Hedging Options Positions

Consider three puts, all written on the same stock. One of the puts has a delta of -0.8, one put has delta of -0.5, and other put has a delta of -0.1. Assign these deltas to the puts in the following table.

Put Exercise Price Delta

A 10 ?

B 20 ?

C 30 ?

Please explain why these deltas are assigned to the puts?