Correct option is D
Option (d) is the correct meaning of the given idiom.
Given Idiom: Part and parcel – Something that is an essential or important part of something else. (अभिन्न हिस्सा)
Example: Challenges are part and parcel of running a business.
Other related idioms and their meanings:
· Ingrained habit – A deep-rooted routine.
· Second nature – Something you are used to doing easily.
· Staple element – A basic and essential item or feature.