Choose A, B, C, or D to indicate the sentence that best combines each pair of sentences in the following questions: The rainy weather has had considerable benefits for organic vegetables. The local people have started to export them to other countries.

• A. 
  Only if the rainy weather had considerable benefits for organic vegetables would the local people start to export them to other countries.
• B. 
  Only after the local people have started to export oganic vegetables to other countries did the rainy weather have benefits.
• C. 
  So benefical is the rainy weather that the local people have started to export organic vegetables to other countries.
• D. 
  If it were not for benefits of the rainy weather, the local people would have started to export organic vegetables to other countries.