Which best describes pitch?
the amount of time taken for a longitudinal wave to produce one cycle
the number of cycles per second perceived by the human ear
the amplitude of a wave when the natural frequency is matched
the distance between two corresponding parts of a transverse wave

The best description of the word "pitch" among the given choices is the "number of cycles per second as perceived by the human ear." It is considered a property of sound that makes us judge a sound to be considered as "higher" or "lower" wherein it can be quantified by actually measuring its respective frequency.