The main reason why Long Term Potentiation (LTP) is one of the most widely studied neuroscientific phenomena is that it?

The main reason why Long Term Potentiation (LTP) is one of the most widely studied neuroscientific phenomena is that it
A ) involves a synaptic change similar to the synaptic change that has been hypothesized to be the basis of memory storage.
B ) can easily be studied in humans.
C ) involves readily accessible neocortical circuits
D ) occurs only in mammals.
E ) can be induced by both electrical and chemical stimulation.