What is the best way to: To heat dark chocolate to make a magic shell for avocado popsicles.

Choices:
(A). Combine coconut oil and chopped dark chocolate in a bowl. Heat in oven for one minute. Mix thoroughly until smooth. If there are still chocolate chunks, heat for another 30 seconds and mix.;
(B). Combine coconut oil and chopped dark chocolate in a bowl. Heat in microwave for one minute. Mix thoroughly until smooth. If there are still chocolate chunks, heat for another 30 seconds and mix.;
Answer:
(B).