The correct answer is B. Transistor.
A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power. It is composed of semiconductor material with at least three terminals for connection to an external circuit. A voltage or current applied to one pair of the transistor’s terminals changes the current through another pair of terminals. Because the controlled (output) power can be higher than the controlling (input) power, a transistor can amplify a signal. Today, some transistors are packaged individually, but many more are found embedded in integrated circuits.
Transistors are used in almost all modern electronic equipment, and are found in virtually every electronic device. They are the basic building blocks of modern computers, and are also used in many other electronic devices such as cell phones, televisions, and radios.
A diode is a semiconductor device that allows current to flow in only one direction. It is made of two semiconductor materials, one of which is P-type and the other N-type. The P-type material has an excess of positive charge carriers, while the N-type material has an excess of negative charge carriers. When a voltage is applied to a diode, the positive charge carriers in the P-type material are attracted to the negative terminal of the voltage source, while the negative charge carriers in the N-type material are attracted to the positive terminal. This creates a current that flows through the diode in the forward direction. If the voltage is applied in the reverse direction, the charge carriers are repelled from the terminals, and no current flows.
A capacitor is an electrical device that stores energy in an electric field. It is made up of two conductive plates separated by an insulating material. When a voltage is applied to the capacitor, the charge carriers on
the plates are separated, creating an electric field between the plates. The amount of charge that can be stored by a capacitor is proportional to its capacitance.An inductor is an electrical device that stores energy in a magnetic field. It is made up of a coil of wire.
When a current flows through the inductor, a magnetic field is created around the coil. The amount of magnetic field created by an inductor is proportional to the current flowing through it.In conclusion, the device which transfer the signal from low resistance region to high resistance region is B. Transistor.