Which achievement revealed Bernardo Alberto Houssay's intelligence as a boy?

Question

a. He wrote his first book before he was 10 years old
b. He was admitted to the university at age 14
c. He learned to read and write at age 4
d. He knew more than his parents

Answer 1

The achievement that revealed Bernardo Alberto Houssay's intelligence as a boy is c. He learned to read and write at age 4.