Questions: Based on the root "form," which means "shape," what word best completes this diagram? reform informer formula chloroform

The answer is "reform."

Explanation for each option:

1. Reform: This word is derived from the root "form," meaning "shape," and the prefix "re-," which means "again" or "back." "Reform" means to shape again or to improve by making changes, which fits well with the concept of altering or reshaping something.

2. Informer: While this word contains the root "form," it is not directly related to the concept of "shape." Instead, "informer" refers to a person who provides information, and the prefix "in-" does not relate to reshaping.

3. Formula: This word also contains the root "form," but it refers to a set of rules or a mathematical expression, not directly to the concept of shaping or forming something.

4. Chloroform: This word contains the root "form," but it is a chemical compound used as an anesthetic. It does not relate to the concept of shaping or forming in the context of the diagram.

Therefore, "reform" is the best choice as it directly relates to the concept of reshaping or forming again.