Answer:
When they ask for the rows, that means we need to divide everything by the column totals, not the row totals. (See how there's a total row and a total column? We use the total column.) This seems counterintuitive: just think of it as horizontal.
Let's try the "get to work before 9 am" row.
8/11 = .73
3/11 = .27
11/11 = 1.00
It works! Choice A is correct.
Let's now try the "get to work after 9 am" row.
5/9 = .56
4/9 = .44
9/9 = 1.00
It works too! So if you're allowed to put two answers, choices A and B would both be correct.