Answer :
1) Judy spends her allowance, five dollars, very quickly.
2) The following sentence does not contain any errors in comma usage: Mrs. Beecher, whose maiden name is Parker, just painted her house blue.
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For the first one the answer is variant B because ' five dollars' it's the developed apposition which has to be izolated throw a pair of commas.
For the second one the correct answer is variant A because ' whose maiden name is Parker' it's the developed apposition of the sentence which gives more details about the subject.
For the second one the correct answer is variant A because ' whose maiden name is Parker' it's the developed apposition of the sentence which gives more details about the subject.