Which of the following is a feature of behavioural economics?单项选择题

a. Firms make decisions based on producing goods and services to maximise their profit.

b. Humans are not emotional, confused, or easily distracted, weighing up the benefits and costs of decisions.

c. Consumers behave in unpredictable ways when making purchases. Decisions are based on social and psychological factors.

d. Consumer decisions are based on rational decision-making. The main aim is for consumers to pay a lower price for goods and services.