Answer: Choice C
{1, 1, 2, 3, 5}
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We have

Showing the first two terms are 1,1.
The answer is between choices B and C because of this.
To get the nth term
, we add up the two previous terms before it
and

So to get the third term
, we'll add up the first two terms

The third term is therefore 2.
The sequence so far is {1,1,2} which matches with the first three terms of choice C.
Then we can say:

Further confirming the answer. I'll let you check the next set of terms.
For more information, check out the Fibonacci numbers.