The options are:
- to help the reader visualize the thorough precautions that were in place
- to persuade the reader that safety precautions should always be followed
- to inform the reader of what could happen if precautions were overlooked
- to explain in great detail why such precautions were needed for the situation
Answer:
- to help the reader visualize the thorough precautions that were in place.
Step-by-step explanation:
In the given excerpt, the key purpose for which the author includes the given paragraph is that 'it assists the readers in visualizing the detailed precautions that were there.' It includes every minute detail regarding the cautions to be kept in mind while following the order which is reflected through the descriptions of even the directions('left Fort...headed South) along with the other small details like 'line of...automobiles...officers wearing civilian clothes...line of cars...behind two unmarked...snow-white..etc.'). These details allow the readers to imagine the seriousness of the zone in real and understand it better.