If a certain combination of goods and services lies inside the production possibilities curve for an economy, which of these statements must be true?

i’m   sure probably just geuss and see which one you can get right, i’m pretty sure it is the combination of goods and services

it would be d). more resources must be obtained to attain that combination of goods and services

answer; ///i believe the correct answer is (b) the writing of the ancients who lived in india after the indus valley inhabitants died out;

answer; biological;