At what age did samurai boys begin learning to use a wooden sword?

A. 3 years old
B. 5 years old
C. 7 years old
D. 13 years old

C. 7 years old

In traditional Japanese samurai culture, boys typically began learning to use a wooden sword, known as a bokken, at the age of 5 years old. Therefore, the correct answer is B. 5 years old.