Direct object is D. A NOUN, PRONOUN, OR WORD GROUP THAT RECEIVES THE ACTION OF THE VERB.
Direct object follows a transitive verb (action verb) not a linking verb. It is always placed after the verb not before it. It receives the action not modifies the action verb.
The answer is C I’ve looked up the word and it means happy and joy is a synonym of happy
"What's in a name? That which we call a rose by any other name would smell as sweet." It means that it does not matter to Juliet that Romeo is from the rival family, the Montague. It became a popular reference for the name things that does not get affected their true nature and characteristics.
You didn't Underline or point out the very but I had this question before the answer is B