Which of the following can be inferred from the pa...

Câu hỏi: Which of the following can be inferred from the passage about the term “weather modification”?  

A It was first used by Vincent Schaefer.     

B  It refers to only one type of cloud seeding.      

C It is not as old as the term cloud seeding. 

D It has been in use since at least 1946.