Let \(\text{ }\!\!\Delta\!\!\text{ }ABC\sim\text{ }\!\!\Delta\!\!\text{ }QPR~and~\frac{ar\left( \text{ }\!\!\Delta\!\!\text{ }ABC \right)}{ar\left( \text{ }\!\!\Delta\!\!\text{ }PQR \right)}=\frac{4}{25}.\) If AB = 12 cm, BC = 8 cm and AC = 10 cm, then QR is equal to:

• A. 15
• B. 18
• C. 25
• D. 20