I think it would be d or a
You didn't italize or mark the phrase, but I see one good candidate:
"The circus animal trainer" is in a way another name given to Mervin, a kind of "renaming" him: this is called an appositive phrase, so if this was the phrase appositive phrase is the answer! (also, I don't see the other phrases here).
Answer:
Turns out, dogs have fewer cone receptors than humans — which means they can't see as many colors. Human cones can detect 3 colors: red, green, and blue. ... This boosts dogs' night vision even more and is why dogs' eyes shine in the dark. Turns out, dogs' eyes see much more than just black and white
Explanation:
Answer:
B
Explanation:
The other sentence's aren't using proper grammer