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Professional American football player Fred Cox invented one of the world's most popular toys. In the 1970s, he came up with the idea for the Nerf football, which ________ of the harder and heavier regulation football.

Which choice completes the text so that it conforms to the conventions of Standard English?
Difficulty: Medium
A:

were a smaller, foam version

B:

are smaller, foam versions

C:

were smaller, foam versions

D:

is a smaller, foam version

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