GMAT Sentence Correction (SC) | Re: The law demands that a driver

The law demands that a driverpasses an eyesight test before obtaining a license irrespective of whether the driver wears corrective lenses.

A command subjunctive mood requires the use of the subordinate verb in the base form.

a, passes an eyesight test before obtaining a license irrespective of whether the driver wears corrective lenses ---‘Passes’ is not base form. It is present tense form

b, passing an eyesight test before obtaining a license irrespective of whether the driver wears
...

---