(Solved): Question In context, which of the following is the best version of the underlined portion of sentenc ...

Question In context, which of the following is the best version of the underlined portion of sentence 7 (reproduced below)? Researchers know that a happy smile is accompanied by activity in the brain's reward circuits and that mimicking a happy smile can excite those same areas of the brain and make someone feel happy. (as it is now) circuits; and that circuits: and that circuits: and