The number regarded as lucky number in Italy is nine.
B
Correct answer
Explanation
In Italian culture, the number 17 is considered unlucky (not 9), because when written as Roman numeral XVII, it can be rearranged to spell "VIXI" which translates to "I have lived" (implying "I am now dead"). The number 13 is also unlucky in Italy, not 9. The number 3 is often considered lucky in Italy.