What is the correct contextual meaning of the homonymous word-pair 'अगम - आगम'?

Let's define the exact meanings of both homonymous terms:
* अगम: Refers to a place or object which is inaccessible, unapproachable, or extremely difficult to find, meaning rare ($\text{दुर्लभ}$).
* आगम: Refers to source, arrival, or origin ($\text{उत्पत्ति}$), and can contextually mean scriptures.

Therefore, the correct ordered pair of meanings is Rare - Origin ($\text{दुर्लभ - उत्पत्ति}$), which corresponds to option (C).