Condensed Notation for Pairing Real Vector Elements into Complex Numbers

A real-valued vector of even dimension can be reinterpreted as a complex-valued vector of half the dimension by pairing adjacent elements. The first element of each pair forms the real part and the second element forms the imaginary part of a new complex number. For instance, the pair of real numbers (a, b) would become the single complex number a + ib. Given the real-valued vector v = (8, -2, 0, 5, 1, 3), which of the following represents the correct transformation into a complex-valued vector?

Real to Complex Vector Transformation

A transformation process creates a complex-valued vector by pairing adjacent elements of a real-valued vector of even dimension. The first element of each pair becomes the real part and the second becomes the imaginary part of a new complex number (e.g., the pair (a, b) becomes a + ib). If this process results in the complex-valued vector c = (4 + 2i, -1 + 5i, 0 - 8i), what was the original real-valued vector?