Which of the following transitional words or phrases should be used to conclude? a. Although c. Therefore b. Consequently d. all of the above

d, they can all end with those words in the concluding sentence.

The correct answer is D.

Explanation:

All three of these words can be used in the concluding sentence.

"Altough" can be use to contrast ideas that have been discussed in previous paragraphs.

"Therefore" and "consequently" may be used to show the relationship between the argumenets presented and the conclution itself.