Final answer:
The correct choice for the scenario where all workers spend their time mowing lawns is 30 lawns mowed, 0 cars washed. This is based on the assumption that the combined daily output is exclusively from mowing lawns since no time is allocated for washing cars.
Step-by-step explanation:
If Jacques, Musashi, and Sean each spend all their time mowing lawns, and we assume that they can all produce the same amount of services per day, the output of their work will be exclusively in lawn mowing. Given that all three of them are working for 10 hours a day, the total number of lawns mowed would be the combined output of all three workers. None of the time is allocated to washing cars, so the number of cars washed will be zero.
The correct choice for the scenario where all three spend all their time mowing lawns is a. 30 lawns mowed, 0 cars washed.
Since the question does not specify the exact number of lawns mowed or cars washed by each worker per hour, we will use the simple assumption that each worker is capable of mowing a certain number of lawns per day. By not dividing their time between tasks and focusing solely on mowing lawns, they maximize the number of lawns mowed. Therefore, given that each worker mows lawns for the entire day, we can conclude that the output will be all in lawns mowed with no time spent on washing cars.