Explanation:

- GDPMp – Depreciation: This calculation results in Net Domestic Product at Market Prices. It removes depreciation, but doesn't relate to GNP.

- GDPMp + Net Factor Income from Abroad: Gross Domestic Product at Market Prices plus Net Factor Income from Abroad gives us Gross National Product at Market Prices. This is correct because it involves the income from abroad, distinguishing it from GDP.

- GNPMp + Subsidy: This adds subsidies to an already complete GNP calculation, which is not standard for calculating GNP.

- None of the above: Incorrect if any of the above options accurately define GNP.

Option 2: GDPMp + Net Factor Income from Abroad is the correct explanation.