Do you have any [EXPERIENCES] of working with children?
B
Correct answer
Explanation
The sentence 'Do you have any [EXPERIENCES] of working with children?' is grammatically incorrect. 'Experience' meaning 'knowledge/skill gained from doing something' is uncountable when used generally. The correct form would be 'Do you have any experience of working with children?' without the -s. Only when referring to specific, distinct events would 'experiences' be correct.