Force Vectors in Equilibrium

[Labkid]

The book I am using says the answer is C but doesn't explain why. All it says is:

"You do not need to look at the diagram to solve this problem. The only answer that could be false with all others being true is C. Make a triangle with the vectors to prove to yourself they sum to zero."

I get that you can have a "constant velocity" of zero. I don't understand what they mean by making a triangle with the vectors to prove they sum to zero... how?

I find physics to be the worst part for me seeing as I already don't like it and I have trouble separating real info from "fluff" they use to confuse me.

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[Teleologist]

They're componentizing the forces so you can add them easily.

 

[Labkid]

They're componentizing the forces so you can add them easily.

Thanks, they made it sound as if you made a triangle using the three vectors, not making several triangles to show they balance.

Do you have any suggestions for some sources that ask more conceptual questions like this one? (I already have Kaplan & Princeton review).