Which sentence includes a subordinate clause?
A
The Chinese government declared the South China tiger a pest in the 1950s, so thousands of these tigers were slaughtered.
B
The Chinese government declared the South China tiger a pest in the 1950s.
C
After the Chinese government declared the South China tiger a pest in the 1950s, thousands of these tigers were slaughtered.
D
Thousands of South China tigers were slaughtered.
A
B
C
D
