In area it is about the same size as the USA(without Alaska)

In area it is about the same size as the USA(without Alaska),which has .
A.three times more than as many people
B.as more than three times many people
C.more than as three times many people
D.more than three times as many people
The ground is slippery.Hold on to the rope and don’t _________.
A.put off B.turn up C.let go D.take apart