Origin of Life on Earth Question, Need Help Please!!

Many approaches are used in examining how life originated on Earth. Currently, the most promising of these approaches involve _________________.

A) studies of Martian meteorites

B) studies of organisms living around deep-sea ocean vents

C) studies of the fossil record

D) laboratory simulations of conditions present on the early Earth

Im almost certain it is B, but they also do the lab simulations.

would guess "B",
but "D" is possible;

if you have a textbook check how it evaluates the alternatives