Final answer:
Speaker D is expressing views derived from the laissez-faire theory.
Step-by-step explanation:
The speaker who is expressing views derived from the laissez-faire theory is Speaker D. Laissez-faire is an economic theory that advocates for minimal government interference in economic affairs and emphasizes individual freedom and self-interest.
Speaker D's statement aligns with this theory as they argue that government should allow each individual to pursue their own goals, which is consistent with the idea of limited government intervention.