$15.$ Which component is most likely to be upgraded to improve an engine's cooling efficiency?

$-$ A$)$ Fuel Injector

$-$ B$)$ Radiator

$-$ C$)$ Turbocharger

$-$ D$)$ Exhaust Manifold

$16.$ What is the primary advantage of using an intercooler in forced induction engines?

$-$ A$)$ Increases the fuel flow rate

$-$ B$)$ Reduces the temperature of the compressed air

$-$ C$)$ Enhances the exhaust gas recirculation

$-$ D$)$ Increases the engine displacement