The writer and his friends cut short the skiing lessons because:
Option A is the correct answer because it is clear from the sentence ‘Soon, exhausted we cut short the lesson and retreated to the institute’ that the writer and his friends were tired and needed to rest.
Option B is incorrect because from the sentence ‘The
helmeted toddlers skimming around like small gnats were an embarrassing
contrast to our clumsiness. But we ignored them firmly.’ It can be understood
that they had no issues to be in the same place as toddlers. Thus, option B is
not the right answer.
Option C is incorrect because it is mentioned in the paragraph that they learned
only skiing. Thus, they did not have to go for other lessons.
Option D is incorrect because in spite of slipping and falling, the writer and his friends continued learning. So, option D is not the right answer.