On the Basis of Knowledge Obtained in Her Economics Class

On the basis of knowledge obtained in her economics class, Sarah is likely to conclude that:

A) if the summer camp job doesn't require any special skills, the wage offer is likely to be lower than otherwise
B) the lifeguard job is likely to be more fun than the summer camp job, so its wage is likely to be higher
C) the summer camp job requires some night shift work, so wages are likely to be lower
D) all of the above are true