Question from maths quest

[99.96]

I was having a bit of trouble with this question:
When calculating a least-squares regression line, a correlation coefficient of -1 indicates that:
A) the y-axis variable depends linearly on the x-axis variable
B) the y-axis variable increases as the x-axis variable decreases
C) the y-axis variable decreases as the x-axis variable decreases
D) all the data lie on the same straight line
E) the two variables depend upon each other

I originally had B, but then D looked good as well. The answer says D. Anyone care to explain why it isn't B?

[adRo93]

Though it is true, it can also be true for data without a correlation of -1.
I think this question is more of a 'which is the most correct' question. Pretty silly imo!

[iroflmfao]

Pretty much what he said.

What exam is this btw ? It sounds fun

[99.96]

Ah right, fair enough.
Its not an exam, question out of a book