Evaluations for input

A finite automaton (FA) is an abstract machine that can be used to represent certain forms of computation. <image 1> The above FA identifies which of the following regular expressions?

(A) for

(B) [a-z][a-z0-9]*

(C) ([1-9][0-9]*)|0

(D) none of the above

Answer with the option's letter from the given choices directly. No punctuation.