Answer is D. It is straightforward question.
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ans is obviously D.In this argument Its saying that florida is populated almost exclusively by retired people and few children but in florida rental business of infants and small children`s furniture are thriving.If we say that many residents of these communities must provide for the needs of visiting grandchildren several weeks a year then it will reconcile the discrepancy.

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I agree with other posters here.
Only D explain why family without children need to rent for furniture for infants

Which of the following, if true, best reconciles the seeming discrepancy described above?
(A) The businesses specializing in the rental of children’s furniture buy their furniture from distributors outside of Florida. ---Doesn't explain why they need to rent children's furniture.
(B) The few children who do reside in these communities all know each other and often make overnight visits to one another’s houses.
------Doesn't make sense to rent furniture just for overnight visit, is it?
(C) Many residents of these communities who move frequently prefer renting their furniture to buying it outright. -----If it's rental for normal furniture then it might make sense but it's children's furniture and most family in Florida don't have children so it doesn't explain.
(D) Many residents of these communities must provide for the needs of visiting grandchildren several weeks a year. ------ Only possible answer choice why family with no children will need to rent for children's furniture
(E) Children’s furniture available for rental is of the same quality as that available for sale in the stores
----- Doesn't explain why family with no children will have the reason to buy or rent children's furniture.

Hope this help.

(A) The businesses specializing in the rental of children’s furniture buy their furniture from distributors outside of Florida. -- irrelevant,who cares where the stores buy furnitures from.
(B) The few children who do reside in these communities all know each other and often make overnight visits to one another’s houses. -- this actually weakens at best..sales should decrease.
(C) Many residents of these communities who move frequently prefer renting their furniture to buying it outright. -- irrelevant,as we are only concerned about infants and their furnitures.
(D) Many residents of these communities must provide for the needs of visiting grandchildren several weeks a year. -- Bingo..Loving grandparents reside in the community and they do take good care of their visiting GC on occasions like Memorial day -:)
(E) Children’s furniture available for rental is of the same quality as that available for sale in the stores -- Good for kids,but irrelevant