A is the fragment. "Because...night" is not a sentence. It is a dependent clause. You can attach it to a predicate and explain what happened when he walked at night, but the predicate isn't given. Since you only have an independent cause, which is given away by the word because, this is a fragment. B, C, and D have subject, verb, AND predicate/no dependent clause. You have to have a dependent clause (a fragment sentence) attached to an independent (an actual sentence). I know this is lengthy but I hope it helps.
Hyperbole is when you use language to exaggerate what you mean or emphasize a point. It's often used to make something sound much bigger and better than it actually is or to make something sound much more dramatic. Hyperbole is a figure of speech.
While the alarm is ongoing, everyone should perform “duck, cover and hold”. Remain in this position until the “shaking” stops. As soon as the shaking stops, immediately evacuate the school building and proceed to identified evacuation areas using the pre-determined routes guided by the class marshall or teacher.