In An inconvenient truth, the most likely reason the author uses the heading A silet alarm is to

A. Use an image that all readers can visualize
B. Show there is a problem that many do not know about
C to bore the reader
D frighten readers so they will take action

B. Show there is a problem that many do not know about

The most likely reason the author uses the heading "A silent alarm" in "An Inconvenient Truth" is:

B. To show there is a problem that many do not know about.

To determine the most likely reason the author of "An Inconvenient Truth" uses the heading "A Silent Alarm," you can analyze the possible options:

A. Use an image that all readers can visualize: This option suggests that the author uses the heading to create a vivid mental image that all readers can understand. It is possible that the author wants to convey a specific message or idea through this visual representation.

B. Show there is a problem that many do not know about: This option implies that the purpose of the heading is to bring attention to a problem that is not widely recognized or acknowledged. By using the phrase "silent alarm," it could indicate that there is a danger or threat that is not immediately obvious but still requires urgent attention.

C. To bore the reader: This option suggests that the heading is intentionally dull or uninteresting, with the goal of reducing reader engagement. However, this seems unlikely as authors generally strive to maintain reader interest.

D. Frighten readers so they will take action: This option implies that the author aims to instill fear or concern in readers so that they are motivated to take action. By using a phrase like "silent alarm," it could create a sense of urgency and encourage readers to address the issue.

Considering these options, the most likely reason the author uses the heading "A Silent Alarm" in "An Inconvenient Truth" is D: to frighten readers so they will take action. By using this phrase, the author may intend to create a sense of alarm and urgency, prompting readers to recognize the seriousness of the issue and encourage them to take necessary steps to address it.