Source Text: 3030 Question 5Select one: a. If a wage earner tightens the belt to save 10,000 yuan each year, it would still take them at least 30 years to save 300,000 yuan. b. It would spend 30 years for a wage earner to save ten thousand annually even with his belt tighten!' c. It would still take 30 years for a worker who tightens his belt and saves ten thousand a year. d. A wage earner would need to save for 30 years to accumulate that amount of money