Engineers are always trying to design electrical devices that are more and more energy efficient. They cannot make a device that is absolutely $100\%$ efficient because not all of the energy from electricity that runs the device can be converted to the type of energy that the device was intended to provide. Imagine lighting engineers have designed a new type of light bulb to replace the fluorescent light bulb. During one $10-$second test of a prototype of the new bulb, they determine that when $2,000$ units of energy from electricity are supplied to the bulb, $100$ units of energy are used to warm the bulb, $1,000$ units of energy are used to warm the surrounding area, and $900$ units of energy appears as visible light. In this case, what is the efficiency of the prototype bulb?A$.5\%$B$.45\%$C$.50\%$D$.82\%$E$.95\%$