Tìm các số tự nhiên n, biết:

a) 33.2n = 432

b) 784 : 7n = 24

c) 9 < 3n : 3 < 81

d) 2. 3n = 6.37

e) 34. 3n = 93

f) 2n+2 - 2n = 96

The number of homeless people after the flood _____ dramatically.

A. are increasing

B. has increased

C. increase

D. had increased