Solution:Thomas Parnell (1679-1718), Edward Young (1683-1765) and Robert Blair (1699–1746), these three poets are called Graveyard Poets.
The Graveyard Poets also termed Churchyard Poets, were a number of pre-Romantic poets of 18th century characterized by their gloomy meditations of mortality, skulls and coffins. Moving beyond the elegy lamenting a single death, their purpose was rarely sensationalist. The term graveyard school refers to four poem : Thomas Grey's Elegy written in a County Churchyard, Thomas Parnell's Night-Piece on Death, Robert Blair's The Grave and Edward Young's Night-Thoughts.
Hence, option (d) is correct.