We learn from the passage that the date of sowing cotton is usually______.

A．the government greatly encouraged peasants
B．rains favored the growth of cotton
C．Chad gained independence in the previous year
D．both A and B

A．they are afraid of emergencies
B．they are reluctant to get themselves involved
C．others will act if they themselves hesitate
D．they do not feel any direct responsibility for those who need help