Although fiber-optic telephone cable is more expensive

Correct Answer E

1. Fiber-optic cable is more expensive to manufacture than copper telephone cable
2. a telephone network using fiber-optic cable is less expensive overall than a telephone network using copper cable.
3. This is because copper cable requires frequent amplification of complex electrical signals to carry them for long distances,
4. whereas the pulses of light that are transmitted along fiber-optic cable can travel much farther before amplification is needed.

The above statements, if true, most strongly support which one of the following?

(A) The material from which fiber-optic cable is manufactured is more expensive than the copper from which copper cable is made.
Flaw: Option gives details about manufacturing material cost, as inferred in passage, overall cost is low due to less investment is required for amplification for fiber - optic cable.
This option weaken the statement.

(B) The increase in the number of transmissions of complex signals through telephone cables is straining those telephone networks that still use copper cable.
Flaw : this option gives details about, what makes copper cable useful and strengthen the copper benefit statement, which is opposite to intended meaning of the passage

(C) Fiber-optic cable can carry many more signals simultaneously than copper cable can.
Flaw : very close and one can be selecte this as one of the answer, but this is about application, it doesn't give details about the overall profit, how it is occured or what makes the fiber optic cables less expensive

(D) Signals transmitted through fiber-optic cable travel at the same speed as signals transmitted through copper cable.
Flaw : this option says both are equal in Operation, and demean the entire conclusion and argument

(E) The cost associated with frequent amplification of signals traveling through copper cable exceeds the extra manufacturing cost of fiber-optic cable.
Correct:
This gives details about function with copper cable is expensive, which makes overall cost of copper cable high than fiber optic usage.

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