Answer and Explanation:
Parallel structure in sentences is when the list of items is organized and written in the same way. For example, if a sentence was written “I like to play basketball, play soccer, and play volleyball”, this is in parallel structure because each item is of the form “play ______”.
Here, this is parallel structure because each item is by itself, without being preceded by a verb, except for the very first one, which is allowed because that verb “buy” will apply to every item following.
That’s why this is parallel structure.