Answer:
Technology has become an important part of our educational system, because evolving technology helps disabled children attend school with minimal aid, prepares students to use technology in the real world, and expands their abilities to acquire more knowledge about the world.
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.
