Can you help me with this please

1.The use of face mask prevents spread of the Coronavirus. However, some people still refuse to wear a mask.

A.Graph and briefly explain the socially efficient outcome of this externality

B.Graph, discuss and compare two strategies that will yield the socially efficient outcome.

C.Explain if this externality can be resolved by using Coase Theorem. Highlight conditions leading to the resolution or lack thereof.