Answer:
C. Adverbial
Step-by-step explanation:
Adverbial phrase consists of a group of words that performs the function of an adverb. It could answer questions such as "where, when, how".
The phrase, "at the end of the dock", that is underlined in the sentence above, is an adverbial phrase of place. It tells us where the boat that is painted with garish yellow is.
The type of phrase that is underlined is C. Adverbial