Bart has decided to buy some water balloons rather than get an extra milk at lunch. choosing among economic alternatives is referred to as a)scarcity b) a trade-off c) interdependence d) labor allocation

The answer is B. please rate my comment and star it. thxs

The correct answer is B.

A trade-off is defined as a decision between two options, in which, in order to select one of the alternatives, the other is lost. It is a widely-used term in economics.

The necessity of facing such trade-offs comes from the fact that economic resources are scarce. Each consumer, given a fixed endowment of resources, has to decide on which goods he desires to spend his limited income, provided that his endowment cannot afford them all. Therefore, deciding in economic implies renouncing to the non-selected alternatives (opportunity cost).

The late Cretaceous period and environment changed due to changes in climate when the asteroid hit the planet and covered the sun rays.

Explanation:

As per the fossil records shown the layers A and B are the oldest and they have shells, ammonites, trilobites, and fish that shows it was underwater. The layer D is that formed by the dinosaurs and plants as in the Cretaceous period when plants on land were found.