Which of these sentences uses an appositive correctly?

A. That ladybug, a very delightful insect, just landed on my bedroom windowsill.

B. That ladybug a very delightful insect, just landed on my bedroom, windowsill.

C. That, ladybug a very delightful insect, just landed on my bedroom windowsill.

D. That ladybug a very delightful insect just landed on my, bedroom, windowsill