The correct way to complete the sentence is without a hyphen, "... her long trip, she was grateful she'd asked the dealer about readily available parts when..."
We usually place a hyphen between two words that are used together functioning as one adjective. For example:
However, that is not the case when the first word of the compound adjective ends in -ly. As we know, the ending -ly commonly appears in adverbs, such as "readily" or "rightly." Since the adverb modifies the word that comes after it automatically, there is no need for a hyphen here.
For that reason, the correct way to complete the sentence in the question is:
The complete question is the following:
Select the correct answer from the drop-down menu.
When Sarah's car developed a problem during her long trip, she was grateful she'd asked the dealer about (blank) parts when buying the car.
Learn more about hyphen here:
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