A, B and C are boundin solidumto deliver a specific horse to X. On due date, X demanded delivery of the horse from A but A did not comply. Two days later, the horse was struck and killed by lightning. Based on the foregoing, which of the following statements is incorrect?

a. X may demand payment from any of the debtors including B and C who were not at fault.

b. The obligation of the debtors is converted into a monetary obligation to pay the value of the horse plus damages and interests.

c. The obligation of A, B and C is extinguished by reason of fortuitous event.

d. If B or C pays X, B or C can go after A to recover what he had paid X.