In the following passage, some of the words have been left out. Read the passage carefully and select the correct answer for the given blank out of the four alternatives.
The scenario ________ dramatically today. We have the ________ of powerful Internet monopolies that are much bigger ________ the telcos. Not surprisingly, these companies now see the ________ of monopoly. They would like to combine with telcos to create monopolies for their platforms, ensuring that they control the future of the Internet and freeze their competition ________.

The scenario ________ dramatically today.

1. A
   change
2. B
   had changed
3. C
   has changed
4. D
   changing