B. "Scientists Discover Concrete Evidence of Life on Mars" The other options sound very lazy and informal .
A passive voice refers to the form whereby the subject is being acted on by the verb.
The following active voices will be changed into passive voice as follow:
1. A snake bit Ramesh.
Passive voice: Ramesh was bitten by a snake.
2. I will beat you at tennis.
Passive voice: You'll be beaten at tennis by me.
3. They are watching a cricket match.
Passive voice: A cricket match is being watched by them.
4. She will tell us a story.
Passive voice: A story will be told by her.
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