If a hot air balloon is seen rising above the top of a hill, what is the top of the hill called?

If you see that a hot-air balloon is rising above the top of a hill, what is the top of the hill called?

A. delta point

B. distance system

C. coordinate system

D. reference point

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scorpions are,

c.arachnids

  scorpions are animals in the order scorpiones, under the class arachnida, which makes them a distant cousin of spiders

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force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach