Question: $"$If I didn't have class tonight, I would save the $$4$ campus parking fee and spend four hours at work where I earn $$10$ per hour." The opportunity cost of attending class this evening is:a$.$ $$4$b$.$ $$44$c$.$ $$40$d$.$ $$0"$If I didn't have class tonight, I would save the $$4$campus parking fee and spend four hours at work where I earn $$10$ per hour." The opportunity cost of attending class this evening is:a$.$ $$4$b$.$ $$44$c$.$ $$40$d$.$ $$0$