这是有关玩一个叫jack 的游戏

这是有关玩一个叫jack 的游戏
A player picked up all ten jacks one at a time.Then he followed the roles and finished the second part.The total aumber of times that he picked up jacks is ___
A.5 B 10 C 15 D 20
原文是：
Jacks is the name of a game that is quite popular with children.
To play jacks,you will need a small rubber ball and ten small metal objects called jacks.
The rules for this game are not very difficult.To begin,you put the ten jacks on the floor or ground in front of you.Throw the ball up (but not too high) ,pick up one
jack,and then catch the ball.Keep the jack in your hand and then continue to pick up the other jacks one at a time.You lose your turn if you do not catch the ball,you do
not pick up a jack,or you drop any jacks from your hand.
When you finish all ten jacks,you now try to do the same thing again but with two jacks at one time.This is more difficult of course.You lose your turn if you make any
of the other three mistakes or if you do not pick up exactly two jacks each time
我也是认为是15,