I think "OF..." and "OF..." construction is designed as a trick in this sentence for whom apply the rules of parallelism without paying attention to the core of the sentence.
If the amount of loan does not exceed - marks the beginning of our list
so X, Y and Z
exceed the purchase price of the home, the cost of improvements, and any additional amount borrowed against the home to pay for medical or educational expenses.
E is using almost the same parallelism here but it is changing to meaning to "any additional payment borrowed " by omitting the word, amount.
So A looks good to me.
LGTCH
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"DON'T LET ANYONE STEAL YOUR DREAM!"