Eduardo Spends His Entire Income on 9 Sacks of Acorns

Multiple Choice

Eduardo spends his entire income on 9 sacks of acorns and 4 crates of butternuts.The price of acorns is 6 dollars per sack and his income is 90 dollars.He can just afford a commodity bundle with A sacks of acorns and B crates of butternuts that satisfies the budget equation

A) 6A + 13B = 92.
B) 12A + 18B = 180.
C) 8A + 9B = 90.
D) 6A + 11B = 90.
E) None of the above.