You Feel Like You're Pretty Strong but You'd Like to Improve

You feel like you're pretty strong but you'd like to improve the definition in your muscles. Which training regime would work best?

A) Work on increasing the weight you use in lifting.
B) Work on increasing your replicates at lower weights.
C) Focus on aerobic training.
D) Keep doing what you've been doing, but supplement with creatine.
E) Just eat less.