On a scale from 0-5, where 0 is "not similar" and 5 is "very similar", how similar is the sentence "Missing plane search turns to Vietnamese islands" to the sentence "Missing Malaysia Airlines plane 'crashes off Vietnam'"?

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