XYGWD-8-Q31

Which of the following most logically completes the
argument?

Yorco and Zortech are two corporations that employ large
numbers of full-time workers who are paid by the hour.  Publicly available records indicate that
Yorco employs roughly the same number of such hourly wage workers as Zortech
does but spends a far higher total sum per year on wages for such workers.  Therefore, hourly wages must be higher, on
average, at Yorco than at Zortech, since _____.

1. Zortech
        spends a higher total sum per year than Yorco does to provide its hourly
        wage workers with benefits other than wages
2. the
        work performed by hourly wage workers at Zortech does not require a
        significantly higher level of skill than the work performed by hourly wage
        workers at Yorco does
3. the
        proportion of all company employees who are hourly wage workers is
        significantly greater at Yorco than it is at Zortech
4. overtime
        work, which is paid at a substantially higher rate than work done during
        the regular work week, is rare at both Yorco and Zortech
5. the
        highest hourly wages paid at Yorco are higher than the highest hourly
        wages paid at Zortech