Children above 12 are able to take part in skiing or other activities for them.
A. designed
B. designing
C. to design
D. having designed
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(答案→)A. designed
B. designing
C. to design
D. having designed
解析：考查分词做定语。本题的design与名词other activities构成被动的关系，故使用过去分词的形式，做定语修饰名词other activities。句意：12岁以上的孩子能够参加滑雪孩子其它的为他们设计的运动项目。故A正确。