Since a participle takes the form: verb + -ing, the only word in this sentence which has such a form is B, 'challenging'. 'Puzzle' is a noun, 'crossword' is an adjective, 'created' is a verb.
........................................................................ cassius
Explanation:
ਸੁਣਕੇ ਜੜਾਂ ਪਾਕਿਸਤਾਨੀ ਪਰਾ ਕਿਸਾਨ ਏਕਤਾ ਜਿੰਦਾਬਾਦ