In a famous case, in 1990, a company was forced to honor a coupon from 1950 for a $5 car muffler. By 1990, such a new muffler retailed for $299. This was because:

Select one:

a. The government compels companies to honor all coupons issued

b. The original coupon did not include an expiration date, so it was still technically valid.

c. The company valued corporate social responsibility

d. The customer's car was also manufactured in 1950