Critical Reasoning (CR) | Re: All etching tools are either pin-tipped or bladed. While some bladed

Dear experts,
I have some doubts on this question.
Though I understand 100% why B can make the conclusion True. I believe if I negate B, the conclusion does not 100% collapse
negated B is: There are not as many pin-tipped etching tools as there are bladed etching tools.

So I have 1 example
etching
pin-tipped11engraving
bladed9997engraving
2not engraving

Then I related to the example in Powerscore CR
"For example, let us say that an argument requires the
assumption
...

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