Well, kind of. The reason it is B and not D is that the first sapling is at point 0.

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In this question, it is mentioned that the first sapling is at the start of one lane, and they are separated by a distance of 30 feet. So the saplings will be at positions:

0, 30, 60, 90,…450

If we calculate the number of saplings, it will be [(450-0)/30] + 1 = 15 + 1 = 16. Hence, the option B.

455/30 results in option C. So the way you are interpreting it by only considering the integer part and not taking into account the condition mentioned in the question may be incorrect.

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Thank you!