Question

How is the comma used as an interrupter in this sentence?

If this car, an old junkheap, ever starts, we will go!

appositive
direct address
parenthetical expression
summary
two adjectives before a noun

Answer 1

apositive

Step-by-step explanation:

Answer 2

In this sentence the comma is being used as an appositive. This is because the phrase "an old junk heap" renames or redefines what the "car" is.