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"?

Feds move to require car-to-car safety communication
Guatemala overturns former dictator's genocide conviction

Options:
[a]. 0.
[b]. 1.
[c]. 2.
[d]. 3.
[e]. 4.
[f]. 5.
[a].