Which version of sentence 9 (reproduced below) correctly uses punctuation to reflect the relationship between clauses?

Question

In these key 25 lines, Brutus takes the audience through his decision-making process, as he makes a pivotal choice.
A.
NO CHANGE
B.
In these key, 25 lines, Brutus takes the audience through his decision-making process as he makes a pivotal choice.
C.
In these key 25 lines Brutus takes the audience through his decision-making process as he makes a pivotal choice.
D.
In these key 25 lines, Brutus takes the audience through his decision-making process as he makes a pivotal choice.

Answer 1

The correct version that uses punctuation appropriately to reflect the relationship between clauses is:

D. In these key 25 lines, Brutus takes the audience through his decision-making process as he makes a pivotal choice.

This version correctly places a comma after "lines" to separate the introductory phrase from the main clause, which helps clarify the sentence structure.