The locus of the midpoints of the chords of the circle $x^2 + y^2 = a^2$ which are parallel to $y = 2x$ is:
- A$A$ circle with radius $a$
- B$A$ straight line with slope $-\frac{1}{2}$
- C$A$ circle with center $(0, 0)$
- D$A$ straight line with slope $-2$
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