Final answer:
The percentage decrease in the number of farms cannot be determined with the given information.
Step-by-step explanation:
The percentage decrease in the number of farms can be determined by comparing the number of farms lost over a certain period of time to the initial number of farms. According to the information provided, more than 155,000 farms were lost from 1987 to 1997. To calculate the percentage decrease, divide the number of farms lost by the initial number of farms, and then multiply by 100.
Percentage decrease = (Number of farms lost / Initial number of farms) × 100
Percentage decrease = (155,000 / Initial number of farms) × 100
Since the initial number of farms is not provided, it is not possible to determine the exact percentage decrease. Therefore, none of the answer options (A. 10%, B. 30%, C. 45%, D. 75%) can be confirmed as the correct answer based on the given information.