Answer:
That depends on which part of the sentence is underlined (unfortunately, you didn't underline anything). So, let's go through all options:
A. independent clause - an independent clause is a sentence that can stand on its own because it has a subject and a predicate; in the example above, the independent clause would be: "The holiday dinners are always the best meals of the year."
B. dependent clause - a dependent clause is a clause that cannot stand on its own because it's missing a part; this is why it is always found next to an independent clause. In the example above, the dependent clause would be: "that my family makes."
C. prepositional phrase - a prepositional phrase is a combination of a preposition and a noun/noun phrase. In the example above, the prepositional phrase is "of the year."
D. run-on - a run on sentence is a sentence that is not properly connected; since the sentence above is correct, there are no run-on sentences here.