The graph in option A represents the situation best.
The children are making $1 for every cup they sell.
This means that there is a set rate of increase whenever they sell a cup which means that their profit will increase whenever the number of sups sold increases.
Graph A is therefore the best option because it shows that whenever a extra cup is sold, more profit is made.
The other options are wrong because:
- option B implies that they make a set profit regardless of the number of cups sold which is wrong as the profits should increase with cups sold
- option C and D are wrong because they are not straight lines
In conclusion, option A represents the situation best.
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