Correct option is B
Option (b) is the correct meaning of the idiom.
To the manner born: It means being naturally suited to something, or doing something with natural ease. (Hindi – किसी कार्य में जन्मजात पारंगत होना)
Example: She handles public speaking as if she were to the manner born.
Other related idioms:
·
In one’s element – Doing something you're naturally good at.
·
Second nature – Something done naturally and instinctively.
·
Old hand at – Someone experienced in something.