111k views
0 votes
Although scientists have studied tornadoes for years, the conditions that cause these storms to develop are not fully understood.

a. compound
c. compound-complex
b. complex

2 Answers

0 votes

Answer: letter C

Step-by-step explanation:

User Sethbc
by
7.4k points
6 votes
This would be a "compound-complex sentence," since there are two separate subject nouns and one clause (the second one) is dependent on the first in order to be fully understood. 
User Chocolata
by
8.2k points