Mahogany inc. is a consulting firm. it reports its results on a cash-basis with a fiscal year ending june 30th. mahogany performed services for customers from june 23rd to june 30th, 2016, amounting to $6,000. the customers paid mahogany in full on july 12th. the cash-basis is not in accordance with and mahogany is in violation of the

If these are the missing choices:
A  :  the Securities and Exchange Commission, income principle  
B  : GAAP, revenue recognition principle 
C  : GAAP, expense recognition principle 
D  : the IRS, tax principle 

My answer is: B  : GAAP, revenue recognition principle  

The cash-basis is not in accordance with GAAP, and mahogany is in violation of the REVENUE RECOGNITION PRINCIPLE.

GAAP refers to Generally Accepted Accounting Principle. 

It is stated that income must be recognized when it is earned not when cash is received. Because the company is using cash-basis, they will only report income earned on July 12 when they received the money not when they earned it which is before their fiscal year ending June 30. 
They should recognized receivables from customers before closing the books for the fiscal year.