"C'est vrai."

Translation: It's true.

[TommyOl]

l'audio est horrible

[InvertedGo]

The masculine voice us better than the feminine on this.

[NeetiNayak]

Why not vraie?

[DianaM]

Because "ce" (the front part of "c'est") is always masculine.

[SaturnApollo34]

Why is : " That is right" not a valid option? I was in a French class in School and when the teacher told u " C'est vrai" He meant : That is right

[Arjofocolovi]

It should be accepted, flag it if you have this exercise again.

[StefanieWai]

Why is "that is correct" not valid?

[Paul_W]

Possibly because there is a word for 'correct' also, and this isn't it.

[DuFarge]

Why not 'il est vrai'?

[K333222]

"To make a live comment, react to something, share your experience, we use the construction c’est + adjective masculine singular. It’s your emotion that comes through, not a specific description.
C’est beau ! c’est bon ! c’est chaud !"
http://www.frenchtoday.com/blog/cest-versus-il-elle-est