Question

polyphenols are organic compounds ______ among their many roles, provide pigment that helps protect plants against ultraviolet radiation from sunlight. which choice completes the text so that it conforms to the conventions of standard english? a) that— b) that; c) that, d) that:

Explanation:

The clause "among their many roles, provide pigment that helps protect plants against ultraviolet radiation from sunlight" is a non - essential relative clause modifying "organic compounds". Non - essential relative clauses are set off by commas. "That" is the relative pronoun here, and a comma should follow it.

Answer:

C. that,