Picked the right answer, but do not know why the answer is right

lily88888UID: 2828533

It takes 365.25 days for the earth to make one compllete revolution around the Sun. Long-standing convention makes a year 365 days long, with an extra day added every fourth year, and the year is divided into 52 seven-day weeks. But since 52 times 7 is only 364, anniversaries do not fall on the same day of the week each year. Many scheduling problems could be avoided if the last day of each year and an additional day every fourth year belonged to no week, so that Jan 1 would be a Sunday every year.

The proposal above, once put into effect, would be most likely to result in continued scheduling conflicts for which one of the following groups?

B. employed people whoese strict religious observances require that they refrain from working every 7th day.

I think I got it now.

duijinxiaoziUID: 2585955

恩。
特定日休息，比如周六，如果按“Jan 1 would be a Sunday every year.”来休息。
每年会多出1,2天，不属于任何周。