In all but one of the following situations, the contract is frustrated. Identify the exception.

Question $6$Select one:

a$.$

Jerry, a doctor, is due to perform a heart transplant operation on Mary, and the night before the surgery his arthritis becomes so severe he cannot hold a scalpel.

b$.$

Rudolph is due to appear in a local variety theatre that has just been destroyed in a fire of unknown origin.

c$.$

Gregory, a trucker with whom you contracted last month to haul potatoes tomorrow, phones to tell you that his truck has broken down and the cost of a rental truck is far too expensive for the size of the job.

d$.$

Jack contracts with Bill to build a barn on his one$-$acre lot, but before the permit is obtained, a new law prohibits barns on lots smaller than three acres.

e$.$

Frank has contracted to ride Emperor, a prize horse, in the Canada Day races on July $1,$ but on June $28$ the horse breaks a leg and has to be destroyed.In all but one of the following situations, the contract is frustrated. Identify the exception.

Question $6$Select one:

a$.$

Jerry, a doctor, is due to perform a heart transplant operation on Mary, and the night before the surgery his arthritis becomes so severe he cannot hold a scalpel.

b$.$

Rudolph is due to appear in a local variety theatre that has just been destroyed in a fire of unknown origin.

c$.$

Gregory, a trucker with whom you contracted last month to haul potatoes tomorrow, phones to tell you that his truck has broken down and the cost of a rental truck is far too expensive for the size of the job.

d$.$

Jack contracts with Bill to build a barn on his one$-$acre lot, but before the permit is obtained, a new law prohibits barns on lots smaller than three acres.

e$.$

Frank has contracted to ride Emperor, a prize horse, in the Canada Day races on July $1,$ but on June $28$ the horse breaks a leg and has to be destroyed.