B. lightning
C. warm air
D. cold front
c. social category.
b. e-communities.
d. social networks.
Answer:
c. social category.
Explanation:
100% sure on this one. A social category is not a type of group.
The prefix is en-, the root is act, and the suffix is -ment.
A prefix is a part of a word which is added before the root word. It is always written with a dash (en-). A root word is the primary part of a word to which prefixes and suffixes are added. A suffix is a part of a word which is added after the root word. It is also always written with a dash (-ment).