This question is a rewording of a question I saw several years ago.
The original question involved a flashlight (instead of an umbrella) and the 4 members of U2 (instead of A, B, C and D).

https://www.braingle.com/brainteasers/515/u2.html

Cheers,
Brent

While Mitch's solution is correct, it's important to note - this is not a question that you're likely to see on the GMAT. The GMAT tends not to ask these mind-teaser type problems, like "you have a fox, a goose, and a bag of flour, and you need to cross a river..." These types of problems do not test any specific mathematical concepts, but instead test sequencing logic. The GMAT does sometimes test logical groupings (OG DS D45, OGQ DS8), but in these cases, they're still testing properties of numbers, and not really the sorting logic itself.

The moral of the story is: don't worry about this type of problem.

(Here's a great cartoon on the subject: https://xkcd.com/1134/ )

Hey All,

I'd also like to add something, if I could. I notice so many questions on here with bad grammar in them. I'd like everyone reading this to try to turn over this new leaf: If you notice a question with broken grammar, DON'T DO IT! The bad grammar is proof that the person who wrote it doesn't really know the GMAT, and just by reading those questions, you're going to be cementing bad habits of English grammar.

If there weren't enough great material out there, then maybe people would have no choice. But there's plenty! Anything published by any of the major companies, and also stuff on the side (I think GMAT Hacks is pretty great, actually) should be enough for anyone!

-t

P.S. I noticed the bad grammar here when there's no Oxford comma (A, B, C, and D). "Parking space" should be "parking spaces." The next sentence should say "THE group". The next sentence changes to present tense when the previous sentence was past tense. The next sentence says "two person" instead of "two people". And on and on!