Select the letter of the choice that correctly identifies the underlined word.

The author frequently used co-ordinate clauses to express contrast. (co-ordinate is underlined)

A. the prefix should be followed by a hyphen.
B. the prefix should not be followed by a hyphen.
C. the suffix should be followed by a hyphen.
D. the word is spelled correctly.

I think it's B?

Right!

I think it's b

Yes, you are correct. The correct choice is B. The prefix "co-" should not be followed by a hyphen.

To determine the correct answer, we need to understand the meaning of the word "co-ordinate" and check the rules for hyphen usage with prefixes.

First, let's define "co-ordinate." In this context, "co-ordinate" is used as an adjective to describe the type of clauses used by the author. "Co-ordinate clauses" are independent clauses that have equal importance and are often used to express contrast.

Next, we need to consider the rules for hyphen usage with prefixes. In general, when a prefix ends with a vowel and the root word begins with the same vowel, a hyphen is used to separate them. However, when a prefix ends with a vowel and the root word begins with a different vowel, no hyphen is used.

In the word "co-ordinate," the prefix "co-" ends with a vowel ("o") and the root word "ordinate" starts with a different vowel ("o"). Therefore, according to the hyphen usage rules, no hyphen should be used with the prefix "co-."

Now we can determine the correct answer. Given that the underlined word is "co-ordinate," and based on the rules for hyphen usage with prefixes, we can conclude that the correct answer is B. So your choice of B is correct.