Which of the following are true of Plato?

a. The causes tell us everything we can know about a substance
b. The Forms are unchanging
c. Art is a diversion that distracts us from the search for truth
d. Pleasure is the highest good
e. Souls are trapped in the body
f. Learning on Earth is merely remembering what we already know from our pre-mortal life
g. Souls are the same as the body
h. Governments can lie to the population if it is needed to maintain a just society