What is the view-through rate (VTR) of a campaign that has received 10,000 impressions and 900 views, and a channel that has received 200 subscriptions?

Q)  What is the view-through rate (VTR) of a campaign that has received 10,000 impressions and 900 views, and a channel that has received 200 subscriptions?
  A)  0.2
  B)  0.11
  C)  0.02
  D)  0.09