B. The sentence is incomplete
<span>A participle is defined as a verb form (has an ending of -ing) used as an adjective in the sentence. The modified is the noun that is specified by the participle. In the sentence given, the participle is riding. The modified answers who is riding? in which the answer is we. </span>
Answer:
The correct answer is C
Explanation:
Emily is struggling to decide whether to cheat or do her best
"The space shuttles is the subject."
Simple formula: find the verb of the sentence then ask the question "who or what performs the verb" and the answer to that question is the SUBJECT of that sentence!
In your sentence; ask the question;
"Who or what have made travel to the International space station convenient and possible?
Answer: The space shuttles (that's your subject)