When a tooth begins to decay, a dentist will place a filling into the cavity to restore the tooth back to its normal shape. An engineer is designing a new filling. He has tested four different materials for the filling design and recorded his observations in the table below.Material How longdoes it last? Cost Advantage Disadvantagegold 10–15 years average does not chip easily • can cause pain if near a silver filling• can only be used in large cavitiessilver 10–15 years least expensive does not chip easily can cause allergic reactionscomposite 5 years most expensive • chemically bonds to the tooth• can be used in small or large cavities can chip easilyporcelain 15–30 years average chemically bonds to the tooth can cause tooth pain whenconsuming hot and cold itemsWhich material should the engineer choose if he wants the filling design to be durable and attach to the natural tooth? A. silver B. gold C. composite D. porcelain