The blacks who received Nobel Prizes for Literature are: a. Toni Morrison and Dereck Walcott. b. Toni Morrison, John Steinbeck and Wole Soyinka. c. Toni Morrison, Dereck Walcott and Wole Soyinka. d. Toni Morrison, Dereck Walcott and John Steinbeck.

超越代理权的行为，经过被代理人的追认，被代理人承担民事责任。