The given satellites orbit the respective planets: a. Mars: Deimos (Mars has two small moons, Phobos and Deimos) b. Jupiter: Europa (One of Jupiter's four largest moons, the Galilean moons) c. Saturn: Tethys (One of Saturn's major inner moons) d. Uranus: Titania (The largest moon of Uranus) Therefore, the correct match is a-2, b-3, c-1, d-4.