It can be inferred from the text that the retail price of petrol will go up dramatically if ______.

A．oil-price shocks are less shocking now
B．inflation seems irrelevant to oil-price shocks
C．energy conservation can keep down the oil prices
D．the price rise of crude oil leads to the shrinking of heavy industry

A．Air pollution laws in the United States and in Canada typically don't specify the amount of pollutants released by industries.
B．The neighboring areas of a factory receive less pollution than distant areas.
C．The number of occurrences of acid rain over the last few years has been on the rise
D．It is generally believed that ineffective air pollution laws rather than industries are to blame for acid rain.