More than 20 species of sharks and rays dwell in Gabon's new 18,000-square-mile marine sanctuary, which offer a refuge to many rare and threatened species.

Choose 1 answer:
Choose 1 answer:
(Choice A) NO CHANGE
A
NO CHANGE
(Choice B) have offered
B
have offered
(Choice C) were offering
C
were offering
(Choice D) offers
D
offers