Question

Choose the correct usage:

• A. He bought three coppers.
• B. He bought three types of copper.
• C. He bought three copper.
• D. He bought three pieces of coppers.

Answer 1

Answer:

B. He bought three types of copper.

• Copper" is an uncountable noun, so we don’t use it with a number directly like "three coppers" or "three copper."