Which is true of the communists?
a. they openly reveal their goals.
b. they want existing social conditions changed.
c. they want working people to unite in revolution.
d. all of the above

D) All of the above is true of the Communists. Communists are very open about the social goals they would like to achieve, which does include social conditions being reversed and for working people to unite in revolution against the "bourgeoisie."

I'm pretty sure that's called a volcano

Their writing has not yet been deciphered