A pool of standing water could be hiding A. flash flood currents that could sweep your car away. B. deep sinkholes. C. all of the above.

A pool of standing water could be hiding the deep sinkholes that are present in the pool for draining the water away. So, the correct option that matches with statement above is B.

Standing water refers to a condition of water in the pool when it is more still than the movements displaced by the way of waves and there is very less atmospheric pressure on the water.

Hence, the correct statement will be A pool of standing water could be hiding deep sinkholes present in the pools that drain away the water. And the correct option is B.

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B. deep sinkholes

since there isn't any suggested answers i will give you the reason and hopefully you can figure it

south africa, or rather all of africa, has not been in the location in which it is nowadays throughout the geological past. after the super-continent pangaea started to break apart, gondwanaland, in which was africa, moved further south, and parts of it came to be very close to the south pole. because the climate in this part of the world is very cold due to the very dispersed sun rays in there, what is now south africa, started to freeze, and the conditions were right for the formation of glaciers. the glaciers existed up until the period when gondwanaland started to break apart and what is now africa started to move towards north, sp it warmed up and the glaciers melted.