What’s the answer?

1. Periods of stasis, during which organisms do not change in the fossil record, can be
accounted for in modern evolutionary theory by understanding that -
A. the adaptation of plants and animals have not changed very much in the fossil record.
B. the fossil record has gaps caused by slower than usual rates of sedimentation.
C. a constant climate gives an advantage to species that stay in one place.
D. some organisms live for long periods in a habitat with no selective pressure.