Which of these would be the most reliable method for transmitting waves for communication?
a) the use of printed newspapers and magazines.
b) the use of the postal service to mail a letter.
c) the use of fiber optics to transmit a digital signal.
d) the use of knocking on all the doors in the neighborhood.

The right option is; C) The use of fiber optics to transmit a digital signal.

Explanation:  

The use of fiber optics to transmit a digital signal would be the most reliable method for transmitting waves for communication.

Fiber optics are long, flexible glass or plastic strands that are arranged in bundles (known as optical cables). Fiber optics are used to transmit information (signals) as light pulses over long distances. This technology is mainly used for communication (such as in internet, telephone and cable television) because it can transmit large amounts of information at very high speed. Fiber optics can also be used to inspect the inner part of the body and in automotive industry.

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.