Answer:
Correct options
A.) the $4 in direct costs she would spend to drive to and from her babysitting job:
Emily will have to spend $2 to and $2 on gas for the babysitting job. She will have to consider if she can bear the additional cost compared to the other job opportunity.
B.) the opportunity costs of not working at the store on a Saturday when she babysits:
When Emily is babysitting she has to consider the opportunity cost of working at the retail store. The fact the she will not have to drive to work, instead working at a place close to her home.
Incorrect option
C.) the cost of clothes and personal items (e.g., phone) Emily uses during babysitting:
On both jobs Emily will incur cost of clothing and other personal items, so this is not a cost she should be considering in making a decision between the two jobs.