Physical Education has a plethora of benefits, it not only get you in shape, but it transforms your general outlook on life and changes your persepective and work ethic in general. There are a plethora of reasons PE class is benefitical.
The phrase in the given sentence is option A. A gazelle.
What is a phrase? A phrase consists of words, but cannot stand alone because it does not give a complete idea, unlike a clause. Phrases do not possess a subject and a verb. For example: In the garden, my notebook, her sisters.