The difficult part of learning to ski for beginners is _____________.
In the above mentioned passage, the most appropriate part to complete the sentence is Option B.
The passage talks about the experience of the author while learning skiing. Skiing is amongst the most adventurous sports and requires a lot of practice. The methods of practice are mentioned in the initial sentences, and one of them is to balance oneself. This includes quite a bit of movements too, which is described in option B, with regard to the passage.
The other options A, C and D, though the words “clipping”, “strapping”, “bumping” are mentioned in the passage, they are not said to pose any kind of difficulty, and hence are wrong answers for the given sentence.