List the next three terms in the following sequence: 1, 1, 2, 3, 5, 8,
a. 11, 20, 31
b. 11, 19, 30
c. 13, 21, 34
d. 13, 20, 33

This sequence is called a Fibonacci sequence. The next term in a Fibonacci sequence is the sum of the two previous terms.
So the next term would be the sum of 5 and 8, which is 13.
The next term would be the sum of 8 and 13, which is 21.
The next term would be the sum of 13 and 21, which is 34.

So the answer is (c).

Um what? rephrase that ?