Vectors and scalars questions

Which of the following vector combinations will result in the least amount of displacement? (Note: Vectors $\vec{a}$a, with, vector, on top, $\vec{b}$b, with, vector, on top, $\vec{d}$d, with, vector, on top, and $\vec{e}$e, with, vector, on top have magnitudes double that of vectors $\vec{c}$c, with, vector, on top and $\vec{f}$f, with, vector, on top.)