Which revision best corrects the errors in the given sentence? A firm handshake like a friendly smile, a pleasant attitude, and good manners is a valuable asset in life.

AA firm handshake—like a friendly smile, a pleasant attitude, and good manners—is a valuable asset in life.
BA firm handshake: like a friendly smile; a pleasant attitude; and good manners, is a valuable asset in life.
CA firm handshake, like a friendly smile, a pleasant attitude, and good manners—is a valuable asset in life.