Identify a true statement about the economic model of corporate social responsibility (csr).

a. the economic model of corporate social responsibility (csr) holds that businesses should integrate social goals and economic goals.
b. according to david vogel, investing in corporate social responsibility (csr) when consumers are not willing to pay higher prices to support that investment improves the profit levels of the firm.
c. the sustainability version of corporate social responsibility (csr) suggests that the long-term financial well-being of every firm is directly tied to questions of how the firm both affects and is affected by the natural environment.
d. none of these