Which situation is impossible under a representative democracy?
a. the legislature can declare local laws illegal.
b. legislators are chosen without consulting citizens.
c. citizens vote directly on an issue.
d. the head of state is also the head of the military.

The situation that is impossible under a representative democracy is the one described in option B: Legislators are chosen without consulting citizens.

Representative democracy is a type of democracy which lies on the principle of elected officials representing a group of people, as opposed to direct democracy. In representative democracy, the citizens elect representatives, as in national elections for the national legislature. Elected representatives may hold the power to select other representatives, presidents, or other officers of the government or of the legislature.