What does 人が重なるように働いている mean?


I'm translating a Japanese novel.

Here's a part of the novel I'm working with:

> Aさんの指図をうけてお魚をつぎつぎ焼く人、ならんだおなべのスープをかき回す人、野菜を洗う人、きざむ人、できた料理を大皿に盛る人、
> **人がかさなるようにはたらいています。** つくっても、つくっても、まだまだたりません。

I'm not sure what 人が重なるように働く means, between:

A. There are so many people so they need to be very close to each other while
working.

or

B. Several people are working with the same thing. In this case, several
people are grilling fish, several people are washing vegetables, several
people are chopping vegetables, etc.




The expression is not a common one, but I guess A is closer. Basically 重なる
means something is on top of something else, and in this case, people are very
close to each other as if they are layering. But whether each task is done by
one person simply depends on the context, both are not wrong. The sentence
describes the place is crowded with people busily working.

