Guys...What is wrong with A & D?
A. The nephew of Pliny the Elder wrote the only eyewitness account of the great eruption of Vesuvius in two letters
to the historian Tacitus
ambiguity: great eruption happend in two letters?
D. Writing the only eyewitness account, Pliny the Elder's nephew accounted for
the great eruption of Vesuvius in two letters to the historian Tacitus.
account for=cause thus the meaning we get is "nephew caused eruption"