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Economics A Level MCQ Paper 3 - Help Section

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Would be nice if we had a thread to ask doubts about eco mcq questions. I'll start it off..if you think you know the answer please reply with it.

2 The schedule shows the total utility derived by a consumer of a good X at different levels of
consumption.
quantity of X consumed 1 2 3 4 5 6 7
total utility (units) 30 50 65 75 80 83 84
The consumer obtains three units of utility from the last $ she spends on each good that she
purchases.
What is the maximum number of units of X that she will consume if the price of X is $5?
A 3
B 4
C 5
D 6

Mark scheme says A. Does anyone know how?
 
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since each $ gives are 3 units of utility, $5 gives her 15 units of utility
now find out the marginal utilities obtained from the consumption of the good... in doing so you will see that the MU from 2 to 3 unit is 15 (65 - 50 = 15)... this equals to the amount of utility she derives from spending her money... hence the max unit is 3
 
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