What is \(\rm \frac {p^2}{q^2}\) equal to?

• A. \(\rm \frac {(b - c)(b - d)}{(a - b)(a - c)}\)
• B. \(\rm \frac {(a - d)(c - a)}{(b - c)(d - b)}\)
• C. \(\rm \frac {(d - a)(c - a)}{(b - c)(d - b)}\)
• D. \(\rm \frac {(b - c)(b - d)}{(c - a)(a - d)}\)