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"?

Iran's president condemns use of chemical weapons in Syria
Probe alleged use of chemical weapons in Syria

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