Question

Digital waves carry information as a series of zeros and ones, known as binary code. Analog waves carry a continuous range of values.

Since each piece of digital information is simply a one or zero, it is possible to perfectly reproduce digital information over and over again. So a copy of the information carried by a digital wave can be identical to the original wave.

It is far more difficult to make a perfect copy of an analog wave because
A.
each individual piece of information is either a zero, a one, or a two.
B.
analog waves travel at speeds too great for modern technologies to use.
C.
most analog waves have wavelengths that are too long to reproduce in copies.
D.
the exact value of any one piece of information is not clearly defined.

Answer 1

D.

Analog signals encode information in continuous values (amplitude/phase) that are not defined to discrete steps, so any small noise or error changes the exact value and perfect, infinite-precision copying is impossible. Digital signals use discrete symbols (0/1), so they can be regenerated exactly despite noise.