Final answer:
Students at Hogwarts played Gobstones in The Courtyard. It's a magical variant of marbles and is popular among Hogwarts students who enjoy less airborne games compared to Quidditch. The correct answer is D.
Step-by-step explanation:
Within Hogwarts, some students spent their spare time playing Gobstones in d) The Courtyard. Gobstones is similar to the muggle game of marbles, but with a magical twist: the stones squirt a foul-smelling liquid into the face of the opponent when they lose a point. This game is a popular pastime among Hogwarts students, and it is mentioned as being played in various courtyards around the school. Although it is not as highlighted as Quidditch, Gobstones has its own club and is enjoyed by those who prefer less airborne pursuits.