Explanation

To understand why "roof" is the correct answer that does not add "ves" in the plural form, we need to look at the rules of pluralization in English.

In English, certain nouns that end in "f" or "fe" change to "ves" in their plural forms. For instance, "wolf" becomes "wolves," "shelf" becomes "shelves," and "wife" becomes "wives." These changes are made to maintain the pronunciation of the word in its plural form. This is a common rule for many nouns ending in "f" and "fe."

However, the noun "roof" does not follow this pattern. Instead, it simply adds "s" to form its plural, resulting in "roofs." This makes it an exception to the rule that applies to the other three options.

In summary, the key distinction here is that "wolf," "shelf," and "wife" change to "wolves," "shelves," and "wives," respectively, while "roof" remains "roofs." Thus, the correct answer to the question is "D) Roof."

Reminder Terms: Roof, plural, -s, wolves, shelves, wives, exceptions.