I'm very sorry if this is wrong but A would make the most sense. the formula y=mx+b. m is the slope, and b is the y-intercept so A is the most reasonable.
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If Kyle starts with $600 and wants to end with (at least) $300 She can withdraw up to $600−$300=$300 If he withdraw 20$/ week the 300 will last for 300/20 = 15 weeks