3) A

The value for 1st September would be the value for August since the reading at last day of August would be the reading for 1st September. Therefore, the greatest distance would be the reading for November – value for August.
I suggest you round off all the values to the nearest 100 as this would make it much easier
Red van = 78900 – 68200 = 10, 700
Orange = 73700 – 64400 = 9300
Yellow = 81200 – 71300 = 9900
Green = 75100 – 64800 = 10, 300
Blue = 83400 – 74000 = 9400
Indigo = 78200 – 68600 = 9600
Violet = 72800 – 63100 = 9700

The highest is the red van, so the answer is A.

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