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D is corrent. The installment method of recognizing revenue is appropriate only when "collection of the sale price is not reasonably assured." Under the installment method, gross profit is deferred to future periods and recognized proportionately to collection of the receivables.
A is incorrect.   The installment method of recognizing revenue is appropriate only when "collection of the sale price is not reasonably assured." Under the installment method, gross profit is deferred to future periods and recognized proportionately to collection of the receivables.  
A is incorrect.   The installment method of recognizing revenue is appropriate only when "collection of the sale price is not reasonably assured." Under the installment method, gross profit is deferred to future periods and recognized proportionately to collection of the receivables.  
A is incorrect.   The installment method of recognizing revenue is appropriate only when "collection of the sale price is not reasonably assured." Under the installment method, gross profit is deferred to future periods and recognized proportionately to collection of the receivables.