The selection that contains a fragment is B.
Every other sentence contains two distinct clauses put together by the use of a relative pronoun (which in A and C) or a conjunction (so in phrase D). In B, the two clauses "she doesn't give herself enough credit" and "that's too bad" are not linked syntactically and are simply juxtaposed.
Although not grammatically "correct", the use of a fragmented syntax a frequent trait of oral speech.
Answer: semi-colon
Explanation:
When two related independent clauses are joined to make a sentence, it can only be by a semi-colon
<u>I would risk my life for my friends. </u>
<em>I agree with this statement, because I hold great value in my friend's lives. I could easily risk my own life for theirs in order to protect their well-being.</em>
