This question below is from my Korean textbook.
A 제가 김밥을 준비할까요?
a) 그럼 부탁해요.
The answer is the option a. However, I am wondering why b doesn't work here? Thanks.
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I can't see a situation where this conversation will take place with these exact phrases and honorific conjugations, but let me take a stab at why (a) is better than (b).
Since the question is, "Shall I...?" it is awkward to say, "yes, let's!" and a better teaching premise to answer with a "yes, you are requested to do so [i am requesting you to do so]".
A : 제가 김밥을 준비할까요?
Shall I prepare 김밥?
B with a) : 네, 그럼 부탁해요.
B with b) : 네, 준비합시다.
Yes, let's do that.
If I were to say
"Let's do that together." to
"Shall I prepare 김밥?", I'd rather say
"우리 함께 준비합시다." not
"네, 우리 함께 준비합시다." Since B already said
"네", I think b) is an awkward choice.
If A asked like
"우리 같이(or 함께) 김밥 준비할까요?", than b) would be the answer, not a).
However, for some rare context b) also might make sense, such as when A actually wants to make 김밥 together with B, but if B doesn't want to be bothered with.
If I were to choose only one of them, I would choose a).