Which composition uses a ground bass?

a. “When I am laid in earth” from Purcell’s Dido and Aeneas
b. Vivaldi’s “Spring” Concerto
c. Rondeau from Mouret’s Suite de symphonies
d. “Zion hears the Watchmen Singing” (mvt. 4) from Bach’s Cantata 140,
Wachet auf
e. “Hallelujah” Chorus from Handel’s Messiah

A