Evaluate the Truthfulness of the Following Statements

Multiple Choice

Evaluate the truthfulness of the following statements
I. The horizontal sum of the marginal cost curves of individual plants is called multiplant marginal cost curve.
II. A group of producers that collusively determines the price and output in a market is cartel.

A) I and II are true.
B) I and II are false.
C) I is true; II is false.
D) II is true; I is false.