Rate the similarity of the following two sentences on a scale from 0 to 5, where 0 is "no meaning overlap" and 5 is "means the same thing"?

A boy is playing guitar.
A man is playing a guitar.

Options:
 (a). 0;
 (b). 1;
 (c). 2;
 (d). 3;
 (e). 4;
 (f). 5;
(d).