Cross-Cultural Research Looking at Performance on a Difficult Letter-Unscrambling Task

Cross-cultural research looking at performance on a difficult letter-unscrambling task indicates that

A) Asian-American students worked harder than the European-American students if they were first asked to think about their mothers.
B) Asian-American students worked harder than the European-American students if they were first asked to think about themselves.
C) Asian-American and European-American worked equally hard if they were first asked to think about their mothers.
D) European-American students worked harder than the Asian-American students if they were first asked to think about their mothers.