TOEIC Grammar - Choose the right word

ScottsEnglishScottsEnglish Administrator Posts: 1,296 admin ✭✭✭✭✭✭✭

Choose the right word for the following sentence

Product sales depend heavily ___________ consumer demand. 

A.  of
B.  in
C.  at
D.  on

Product sales depend heavily on consumer demand.

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