To understand the correct option, let us analyze each option given:

Option 1: Transistor - A transistor is an electronic component used for amplification or switching of electrical signals. It is not used to change or control the voltage level of an electrical device such as an electric lamp. Therefore, option 1 is incorrect.

Option 2: Resistor - A resistor is an electrical component that resists the flow of electric current. It is used to control the flow of current in a circuit and can be used to lower the voltage level. Therefore, option 2 is the correct answer.

Option 3: Transformer - A transformer is an electrical device that changes the voltage level of an alternating current (AC). It is commonly used to step up or step down the voltage in electrical systems. Therefore, option 3 is incorrect in this context as it does not specifically address the need to use the electric lamp at a higher voltage.

Option 4: Generator - A generator is a device that converts mechanical energy into electrical energy. It is used to produce electricity and is not directly related to adjusting the voltage of an electric lamp. Therefore, option 4 is incorrect.

Based on the analysis, the correct option to use an electric lamp at a higher voltage of 220 V is