A scientist looking for an optimal location for a new observatory should choose a location

I'm having some difficulty seeing the diagram clearly.but the question says there's a net inward force on the object.so we know right away,  from newton's 2nd law of motion, thatthat baby is accelerating.  it doesn't even matter which way thenet force is pointing.  if there's any net force, then either theobject's speed or else its direction must be changing.

Texas-flood watch and coastal flood barrierscalifornia-try and look for under ground water stream