Estimated to be about 15,000 years old, it is a relative baby compared with Earth’s other very large lakes, __( 45 )__ more than two million years old.
Estimated to be about 15,000 years old, it is a relative baby compared with Earth’s other very large lakes, __( 45 )__ more than two million years old.
A. are
B. which can be
C. they are
D. which being