Read the sentence. the scientists had a theory to explain the unusual relationships in their discovery. which underlined word is a concrete noun?
a) relationships

b) scientists

c) discovery

d) theory

The correct answer is B.

The scientists had a theory to explain the unusual relationships in their discovery.

Explanation:

Concrete nouns mean things that can be seen and touched. For example, "the Cat is lying on the grass", Cat is the Concrete noun, "the Gate prevents a lot from coming in". Other examples include, Spoon, Bag, Cloth, Car, Chair, book, etc.

Given the above, the appropriate answer is Scientists because it can be seen.

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explanation: