Let f be a function for a recursive sequence where the rule f(n + 1) = f(n) + f(n – 1)determines the (n + 1)th term. Given this and the first two terms of the sequence, select each number that is also a term of the sequence.
1,1,...

A.2
B.3
C.4
D.5
E.7
F.9
G.12
H.17
I.21