If b = a + cp and r = ab + \(\frac{1}{2}\)cp², express b² in terms of a, c, r.

• A.b² = aV + 2cr
• B.b² = ar + 2c²r
• C.b² = a² = \(\frac{1}{2}\) cr²
• D.b² = \(\frac{1}{2}\)ar² + c
• E.b² = 2cr - a²