In which of the following does the voter get a chance to choose from only democratic candidates?

Assuming you had to choose between:

The answer is: the Democratic Primary Election.

You could also add the Democratic National Convention, but only pledged delegates get to vote for their Presidential nominee (+ Vice President) in these elections, and not all citizens.

In the case of the Democratic Primary Election, however, all citizens vote for the candidate they want to run as a Democrat in the general election. Winning candidates then send their nominees to the Democratic National Convention.

c.) biotic: snails; abiotic: temperature climate

to reform the distraught soviet union, the democratization of the communist party was promoted through party secretary mikhail gorbachev's policies of “perestroika” and “glasnost.” perestroika refers to the reconstruction of the political and economic system established by the communist party.