Question

earnest means : full of merriment devout or heartfelt lacking attention to rules having special skill

Explanation:

The word "earnest" means sincere and serious, which is closest in meaning to "devout or heartfelt". "Full of merriment" means full of joy, "lacking attention to rules" is about rule - breaking, and "having special skill" is about expertise.

Answer:

B. devout or heartfelt