Sentence 1: East Harlem explosion death toll rises

 Sentence 2: Mexico storm death toll continues to rise

From 0 to 5 (0="no meaning overlap" and 5="means the same thing"), how similar are the two sentences?

Possible answers:
(i) 0
(ii) 1
(iii) 2
(iv) 3
(v) 4
(vi) 5
(i)