Which correlation coefficient indicates the strongest relationship between two variables?

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I'm trying to understand correlation coefficients, and seem to be missing something.

For example,

Correlation coefficient: Indicates the direction, positively or negatively of the relationship, and how strongly the 2 variables are related. I understand that the strength can vary from 0-1 and I thought I understood that positive or negative simply had to do with the direction of the correlation.

This question is part of my review and I don't understand why my answer is incorrect...

Which correlation coefficient indicates the strongest relationship between two variables?

a) -0.85 - This was my answer which I thought was the closest to one (meaning strongest

b)1.94

c)0.58 - This is what the textbook says is the correct answer, but why?

d)0.19

Thanks for your help!

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