Most of my classmates will get this one wrong.  In fact, many perceive it to be a 'trick' question.  
Some will not respond at all thinking to be a comedic interlude intended to reduce stress
and/or break the monotony of taking a test.

Nice try Professor!!  It is not a 'trick' question and, it wasn't until the 21st Century when Gay
Marriage was endorsed as legal with the following proclamation

In order for society to consecrate your gay marriage, please show up to the ceremony
with someone of the same gender.

No One knows why it was an issue in the first place...or, why it took so long... there is
not even a credible theory lending explanation.  
D.        None of the Above
2.  In what Century were homosexual people permitted to legally marry?