Achimpanzee using a long twig to catch termites is an example of a(n)
a. external stimulus
b. patterned behavior
c. learned behavior
d. innate behavior

A chimpanzee using a long twig to catch termites is an example of a learned behavior - c.

When a chimpanzee first observed that using a twig to catch termites could be a useful way of dealing with the termites, he noted that he could do it from then on. 

Ihaven't done that yet, so no idea,but this is not the right place to ask

Predator instincts is what causes it