Bmat 2007 Q7 - cardiac cycle

Can I get an explanation on why B is the correct answer?

left and right ventricles contract at the same time
blood is pumped to the lungs at the same time as blood is pumped to the rest of the body
so the right has the tricupsid valve closed and the pulmonary valve open
the left has the mitral valve closed and the aortic valve open

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