In his famous speech, Dr. Martin Luther King, Jr., repeated the phrase, "I have a dream." Using the same word or phrase repeatedly throughout the speech to emphasize the essential point that the speaker seeks to convey is known as:

Repetition                            

Explanation:

Repetition: In speech, the term "repetition" is described as one of the literary devices that are being responsible for repeating similar phrases or words several times to develop a clear idea and more memorable. Hence, "repetition is not characterized merely as a "figure of speech" rather as a "rhetorical device".

It is often being utilized in songs or poetry, creates rhythm, and therefore brings attention to a specific idea. It directs emphasis on the audience to better remember the information being provided by the speaker.

In the question above, the given statement signifies the "repetition".

d.) continue to rise rapidly