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The triangle \( P Q R \) of area ' \( A \) ' is inscribed in the parabola \( y^{2}=4 a x \) such that the vertex \( P \) lies at the vertex of the parabola and the base \( \mathrm{QR} \) is a focal chord. The modulus of the difference of the ordinates
\( \mathrm{P} \) of the points \( Q \) and \( R \) is:

W
(A) \( \frac{A}{2 a} \)
(B) \( \frac{A}{a} \)
(C) \( \frac{2 A}{a} \)
(D) \( \frac{4 \mathrm{~A}}{\mathrm{a}} \)
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