Select from options: How similar are the following two sentences?

Extremists claim responsibility for Niger attacks
Greek militant group claims responsibility for Golden Dawn killings

Give the answer on a scale from 0 - 5, where 0 is "not similar at all" and 5 is "means the same thing".

Options:
 1). 0
 2). 1
 3). 2
 4). 3
 5). 4
 6). 5
2).