The error in verb voice would be C
I believe the answer would be choice A- you should know your audience and subject before writing an outline. i hope this helps.
The correct answer for 1 is C. While the lifeguard was on duty, she pulled a toddler out of the pool. because it tuns the first clause into an adverbial one.
The answer for the second is C. Subject
That's because "whoever doesn't have a car" is the people who are doing the action.