Work backwards from Lai Hong to Samantha to Jennifer.<br><br>&bull; Lai Hong = \(b\) marks<br>&bull; Lai Hong = 2 × Samantha, so Samantha = \(\frac{b}{2}\)<br>&bull; Jennifer = Samantha − 3 = \(\frac{b}{2} - 3\)<br><br>Final Answer: A: \(\frac{b}{2} - 3\)