The correct option is C If Sam does not play, then it is not a Friday and the sky is not clear
The contrapositive of p⇒q is ∼q⇒∼p.
p: It is a Friday
q: The sky is clear
r: Sam plays
The given statement is (p∨q)⇒r. Its contrapositive is ∼r⇒∼(p ∨ q). Also, ∼(p ∨ q)=∼p ∧∼q. Hence, the contrapositive of the given statement is ∼r⇒∼p ∧∼q
This can be translated as ‘If Sam does not play, then it is not a Friday and the sky is not clear’.