command subjunctive or infinitive: how to decide?

[harpreet1205]

According to a recent study, hand sanitizers require a 60 percent minimum alcohol
concentration for the killing of most harmful bacteria and viruses.

- require a 60 percent minimum alcohol concentration for the killing of
- require that there be a 60 percent minimum alcohol concentration to kill
- require that a 60 percent minimum alcohol concentration be present to kill
- require a 60 percent minimum alcohol concentration to kill
- require that there be a 60 percent minimum alcohol concentration for the killing of

Answer is D. I too chose D but according to Manhattan guide there are certain verbs that take either command subjunctive or the infinitive and require is one of those verbs.

How can I decide which one is correct from grammar perspective.

[RonPurewal]

Hi,
Please post in the correct folder. This folder is for GMAT PREP problems; this problem is definitely not official.

If you want to re-post this thread, please post it in the general verbal folder, with a citation of the original source.

Thanks.