Discussion
An op-amp based comparator with positive feedback is called :
Answer: B
A comparator with positive feedback is a Schmitt trigger.
Feeding part of the output back to the non-inverting input gives the comparator two switching thresholds, an upper and a lower trip point, instead of one. The gap between them, the hysteresis, stops the output from chattering when a noisy input hovers near the threshold, and turns slowly varying inputs into clean square waves.
An astable multivibrator is a Schmitt trigger with an added RC timing network that makes it oscillate on its own, so it is more than a comparator with feedback. A pulse generator is a general instrument, and an integrator uses capacitive negative feedback.
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