Which Subway Exit - Multiple Answers?

Multiple choice question #4 was interesting. The sentence was “我们休息一会儿吧,” (Let’s take a break for a while.) The choices were A. 一点, B. 一起, C. 一些, and  D.一会儿. I think A. 一点 would have made it “rest a bit,” as in having a little bit of something. And B. 一起 would have made it “rest together.” And C. 一些 would have made it “have some rest.” But only D.一会儿 included the element of a short time, as in “rest a while.” Would answers A, B, and C have been grammatically incorrect?