Answer & Explanation :
PPF is graphical representation of goods combinations, which an economy can produce - given resources & technology.
It denotes maximum potential production with given resources & technology efficient utilisation, points under PPF reflect under utilisation, points outside PPF are unattainable.
A. Shift PPF inward - Fall in resources & or technology will reduce the economy production potential of both goods, shift PPF inwards
B. Shift PPF outward - Improvement in resources & or technology will increase the economy production potential of both goods, shift PPF outwards.
C. Country produce inside unchanged PPF - Country utilising resources, technology inefficiently
D. Country produce outside PPF - Given resources & technology, production outside PPF is beyond max production potential & such are unattainable combinations
E. Recession does not affect PPF - If recession just reduces price level & doesn't lead to output quantity fall or unemployment rise/ idle resources ; it still utilises resources & technology efficiently. So, doesn't affect PPC.