The capital of Cambodia is___________ ?

A. Bujumbura
B. Phnom penh
C. La paz
D. Port-Novo

Vientiane (Viangchan), the capital of Laos, and Phnom Penh, the capital of Cambodia, both stand on its banks. About three-fourths of the drainage area of the Mekong lies within the four countries the river traverses on its lower course—Laos, Thailand, Cambodia, and Vietnam.