Question 74

D: The parallel lines extend in the same direction and will never meet.

The sentence uses the word "parallel" as a noun, referring specifically to "parallel lines" which are defined in geometry as lines that run in the same direction and do not intersect.

A) The piece of music uses parallel intervals in pitch.

In this sentence, "parallel" is used as an adjective to describe the type of intervals in music, indicating that they maintain the same interval distance rather than functioning as a noun.

B) The teacher asserted that the quality of the student's film was without parallel in her experience.

Here, "without parallel" is an idiomatic expression that implies the film's quality is unmatched. In this context, "parallel" is functioning as an adjective rather than a noun.

C) The diplomat's intelligence parallels the king's wit.

In this example, "parallels" is used as a verb to indicate that the diplomat's intelligence is similar to the king's wit, thus not serving as a noun in this context.

D) The parallel lines extend in the same direction and will never meet.

This sentence correctly uses "parallel" as a noun, specifically referring to lines that are equidistant and never intersecting, which is a standard geometric term.

Conclusion

Option D is definitively correct as it uses "parallel" as a noun in the context of geometry. The other options incorrectly employ the word "parallel" in adjectival or verbal forms, failing to meet the criteria of the question. Thus, D distinctly stands out as the only appropriate choice.