CUET Economics PYQs

Which of the following is not correct statement ?

An economy has to choose one of the many possibilities that it has at given resources. Therefore, the cost that an additional unit of X commodity in terms of the amount of the Y commodity that has to be forgone is called ................ cost.

Whether to have more consumption goods or to have investment goods which will boost production and consumption tomorrow, is a part of which of the central problem?