Which of the following situations is the best example of a coup d'etat?
a. a king leaves the throne and passes leadership to his daughter.
b. a political party wins more seats in parliament after an election.
c. a candidate wins a popular election and becomes president.
d. a group of leaders forcefully overthrows the current government.

Some gamma ray bursts are hypothesized to come from mergers of neutron stars or black holes. if this hypothesis is correct, what else should we in principle be able to detect from such mergers? a. gravitiational waves b. x-ray bursts c. significant disruption of gas thousands of light-years away in the surrounding galaxy d. an "afterglow" of bright visible light, lasting for weeks