무슨 versus 어느

* When do we use 무슨 (what; what kind of; what type of) & when do we use 어느 (which)?
 - 뭐 (뭐엇 be shortened to 뭣) : what (pronoun)
 - 무슨 : what (adj) needs a noun right after itself.
 - 어느 : which (adj) also needs a noun right after itself. But 어느 is different from 무슨. The interrogative 어느 is likely used when the question is to choose in just several things (or there is some (clear) idea about the answer. Well, I guess so because I'm just a beginner in this field)
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You'll understand this point more clearly in the dialog below.
In the flower shop:
Sh: 어서 오세요. 무슨 꽃 드릴까요? (드리다/ㄹ까요 suggestion form)
A: 나오미 씨, 무슨 꽃 살까요? (사다/ㄹ까요 suggestion form)
B: 글쎄요. 장미 어때요?
A: 좋아요. 그런데 장미가 많아요. 무슨 섹을 살까요?
B: 빨간 색도 예쁘고 노란 색도 예뻐요. (verb stem + 고 = and)
Sh: 어느 걸 드릴까요?
A: 어느 걸 살까요, 나오미 씨?

B: 이걸 사요.
Sh: 몇 송이 드릴까요?
A: 열 송이 주세요.
*Review question: 어때요 : How?
  - eg: 날씨가 어떼요?; 날씨가 어땠어요?
*Review vocabulary: 그런데 : but; however; well.
*Note: 것 means thing; one.
The object 것을 is shortened to 걸.