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"No data on shelf life in the passage → so shelf life can't be an assumption"
This is backwards.

What an ASSUMPTION Actually Is
An assumption is what the argument takes for granted without stating it.
Think about it: If the passage STATED something, it wouldn't be an assumption—it would be a premise.
Assumptions live in the SILENCE of an argument.

Apply This to Your Logic
The vendor's argument:
  • "5-for-4 deal worked for marmalade"
  • "So I'll use the same deal for radicchio"

What's missing? Any acknowledgment that these products are fundamentally different.
Marmalade = lasts 365 days
Radicchio = lasts 5-10 days

The vendor never addresses this. She just assumes "what worked for one will work for the other."
By staying silent on this massive difference, she's ASSUMING it doesn't matter.

You're right that if something isn't mentioned, we can't add random facts.

But here's the distinction:
Can't assume: "The vendor is left-handed" (irrelevant + not mentioned)

Must be an assumption: When the argument compares two things but ignores a critical difference between them
The vendor is literally saying: "These two products are similar enough for the same strategy"
Without addressing that one spoils 70x faster than the other
That silence = assumption that the difference doesn't matter.

Let's destroy the vendor's plan:

Negate (B): "Consumers who buy bulk marmalade (1-year shelf life) will NOT buy bulk radicchio (5-10 day shelf life)"

What happens?
The entire plan falls apart. Nobody buys 5 bunches of something that rots in a week. The 5-for-4 deal fails completely.

This proves (B) is necessary for the plan to work.


Nayana24
But there is no data on shelf life period
NO DATA NO ASSUMPTION
So i eliminated option b) and went with a) as it was next closest answer one can chose

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I think even I had a similar doubt, the way I went about it would be - Enjoying radicchio as much as peach marmalade would not have an impact on the 5 for the price of 4 plan. It does not specify or speak about the sales but does comment on the similarity of the 'enjoyment'

B option on the other hand compares the shelf life of the two products. The assumption would be that the shelf life and the enjoyment would be the same, once the shelf life comes into the picture, it would be easy to compare them on the basis of sales and the similarities/dissimilarities in a better way than option A

This is how I went about it.
sarangadhar


this is how I thought:
I could eliminate C, D, and E. same reasons as given by vivesomnium. Next I eliminated B, thinking that we don't have any clue about shelf life based on the stimulus and becomes irrelevant. And then thought that radicchio could be sold well enough as marmalade based on A. when Consumers enjoy something, that would bring the sales anyway.

Now, coming to vivesomnium explanation:
Based on the reasoning given by vivesomnium for A, if it is true that enjoying something isn't enough for buying it, then it is also true that willingness on something isn't enough for buying it. we have more factors to buys something... So, I am kinda of not fully satisfied with this.

So, can I request for more promising explanation?
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