Which of the Following Actions Would Make Sarah Liable for Battery

Which of the following actions would make Sarah liable for battery?

A) She publishes an article asking the current U.S. President to quit because she thinks he is not doing a good job.
B) She extends her backyard fence, encroaching on two feet of her neighbor's land.
C) She smuggles marijuana into the country.
D) She slaps her ex-husband because he denied her alimony.