Answer:
¡Estoy bien! gracias por los puntos!
Explanation:
You're correct, the answer is D. tomo.
How I remember it is this, in Spanish, "yo" means "I", "yo" has an "o" at the end of it and nearly all conjugations that need to be conjugated to "I ____." will have an "o" at the end!
C. Me gusta nadar. I like to swim.