b. The invention of the puddling furnace improved the quality of iron.
c. The flying shuttle made the first air flight possible.
d. The Bessemer steel process made steel inexpensive to produce.
Answer:
c is the answer
Explanation:
B. the last word in a prepositional phrase
C. a group of words that contains both a subject and a predicate
D. a group of words that modifies another word or group of words