Answer: The dolphin was graceful
Step-by-step explanation:
When a group of words in a sentence do not reference a subject - verb relationship i.e., the subject is not doing anything, this is a phrase. For instance in the sentences: ''we ran to the stadium'' and ''the confused dog barked loudly'', the underlined words are the phrases and notice how it involves the subject doing nothing.
From the options therefore, option C would be correct as it does not show the subject (dolphin) doing something.