They drove over herds of cattle
The correct answer is letter C.
The law of demand says that, as a rule, price and quantity required in a given market are inversely related.
In other words, the higher the price of a product, the less people are willing or can include (everything else unchanged).
When the price of a welfare, overall purchasing power decreases (income effect) and waste changes to cheaper goods (substitution effect).
Other factors may also affect demand.
The British government relaxed rules regulating trade for the American colonies in the late 1600s because the British hoped the colonies would become wealthier and spend more on manufactured goods from Britain.