If a country were to place a limit on the number of cars that could be imported in a year, it would be an example of what kind of trade regulation a) currency control b) tariffc) quotad) subsidy

mark, a civil engineer, entered into a contract with david. as per the contract, mark agreed to design and build a house for david for a specified fee. mark provided david with an estimation of the total cost and the contract was mutually agreed upon. however, during construction, when mark increased the price due to a miscalculation on his part, david refused to pay the amount. this scenario is an example of a mistake.