Question

dutiful means :
most frequent or common
willingly obedient out of a sense of duty and respect
not fanciful or imaginative
of persons

Explanation:

The word "dutiful" relates to fulfilling duties. The option "willingly obedient out of a sense of duty and respect" directly connects to the concept of duty - fulfilling behavior. The other options: "most frequent or common" is about frequency, "not fanciful or imaginative" is about creativity, and "of persons" is too general.

Answer:

willingly obedient out of a sense of duty and respect