Hey there! As any English lover would do, let's get this question solved!
Choice A: The illustrator drew his characters in pencil, then layered in more detail; ultimately he painted each comic strip in watercolor.
Choice B: The illustrator drew his characters in pencil, then layered in more detail ultimately; he painted each comic strip in watercolor.
Choice C: The illustrator drew his characters in pencil, then layered; in more detail ultimately he painted each comic strip in watercolor.
Once read over, We can see that answer choices B and C are incorrect.
That leaves us with Answer Choice A: The illustrator drew his characters in pencil, then layered in more detail; ultimately he painted each comic strip in watercolor.
I HOPE THIS HELPED! HAVE A GOOD DAY!
