Which of the following exemplifies specific performance that a court might order from the party in breach of a contract?

a. A seller ordered to pay back the price of the commodity to the customer having failed to deliver it on-time.
b. A popular singer requested to forgo the fee for her performance at a social fund raising program.
c. The owner of a polluting factory ordered to convert his private plot into a public garden.
d. A movie director ordered to work with an actress he had previously contracted with, instead of one he later found was available for a lower price.

D