Man proposes with diapers

A young man in Guangzhou, Guangdong province proposed to his girlfriend with over 50 packs of diapers. The man, surnamed Feng, said he and his girlfriend have dated for over two years. He planned the proposal after he found his girlfriend was pregnant. Feng arranged some 4,500 diapers packaged in bags into the shape of a giant heart, alongside the Pearl River in the city. His girlfriend was deeply moved and said yes.

How many diapers did the man use to propose?

A. 3,500 diapers

B. 4,500 diapers

C. 5,500 diapers