Joanna quit her $40,000ayear job to open her own business. Her boss offered her a $10,000ayear raise not to quit. When Joanna still insisted on leaving, the boss offered an additional $15,000ayear raise. Joanna's yearly implicit costs of her own business are

A.

$40,000.

B.

$50,000.

C.

$25,000.

D.

$10,000.

E.

$65,000