Question

if the relative clause in bold is nonrestrictive, set it off with a comma. if it is restrictive, submit the text without making any changes. during his tour of the organic chocolate factory, andrew learned about the theobroma cacao which is a cacao tree native to the rain forests of central america.

Explanation:

The relative - clause "which is a cacao tree native to the rain forests of Central America" is restrictive as it provides essential information to identify the specific Theobroma cacao. So, no comma is needed.

Answer:

During his tour of the organic chocolate factory, Andrew learned about the Theobroma cacao which is a cacao tree native to the rain forests of Central America.