All citizens in ancient Athens had the right to attend the Assembly, where they could meet in open discussion and cast votes. This situation is an example of

Direct democracy

Explanation:

Direct democracy is a term that is used to describe a form of government in which all the citizens of a state (often adult males) have the right to vote and partake in the decision of the state.

Hence, where all citizens in ancient Athens had the right to attend the Assembly, where they could meet in open discussion and cast votes is a good example of "DIRECT DEMOCRACY"

i believe your answer is d)

australian plates collided into eurasian plates, and the himalayas formed. the andes mountain range the himalayas and the islands of japan form differently. the andes mountain range formed at the convergent boundary of an oceanic plate and continental plate.