When practicing a speech for extemporaneous delivery, speakers should practice a. so they thoroughly memorize the entire speech. b. in stages. c. until they can give a perfect speech. d. after writing out the speech word for word

Option C  is the answer,until they they are able to give a perfect speech

Explanation:

Extemporaneous speech is a speech given with little or no preparation.

A speech that requires preparation but does not allow the speaker to  read from their write-up is also known as impromptu or extemporaneous speech.

From my explanation above, it is crystal clear that option A is out of context since at some time point extemporaneous is not prepared well ahead, the same applies to option D.

In order to be able to deliver anytime , the speaker should prepare for a wide range of topics such that they can handle most topic areas by preparing until they are able to give perfect speech

my good sir, your answer here is "jvhrwekjhvbebebjb"

your welcome.

answer; i believe the correct answer is (general);