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?

Question

Accepted Answer

is a smaller, foam version

Answer

were a smaller, foam version

Answer

are smaller, foam versions

Answer

were smaller, foam versions