Which description fits complex?

• A. complicated and not easy to understand
• B. involving or made from many different parts
• C. a simple addition
• D. relating to chemistry

Answer: (B)

The main idea here is understanding that complex describes something made up of many different parts that fit together. Complex is commonly used for things that are composed of multiple components or elements that interact, like a system, structure, or idea built from many pieces. That exact sense is captured by the description involving or made from many different parts.

The other options point to related but not exact senses: something described as a simple addition would miss the multiple parts idea, and relating to chemistry or being merely “a simple addition” doesn’t fit the general usage of complex in most contexts.