how would you do this on desmos??

I tried to do it myself but didn't get the result...

Hi, this is my most recent practice test (#6) results. I want to at least aim to get a 1350+-1400 on my first SAT which is Aug. 22 (2 weeks), but I'm having trouble with R&W a lot. I've watched Johns free videos prvided and they helped a lot,but I still need much improvement. Any tips or suggestions from anything or anyone will be very helpful. Thank you guys!!

Why is it not C but B?? I thought the object was singular since it says "of AN object"?? Please help me understand!!!!

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