Which of the following flowers is most likely to be pollinated by birds?

Which of the following flowers is most likely to be pollinated
by birds ?
A A flower with a long, tubular shape and bright red color
B A flower with a strong fragrance and white petals
C A flower that opens only at night and emits a strong scent
D A flower with small, inconspicuous petals and a dull color
Ans: A