Read the following passage: After the death of Antiope, Theseus married Phaedra, daughter of Minos, king of Crete. Phaedra saw in Hippolytus, the son of Theseus, a youth endowed with all the graces and virtues of his father, and of an age corresponding to her own. Which of the following inferences about marriage among the nobility in ancient Greece does this passage support?

a) Marriage was extremely unpleasant for women of noble birth.
b) Marriage served to forge political ties.
c) Marriage was considered to be an expression of undying love.
d) Marriage was a sacred act between two people who loved one another.