<span>The question is asking us to find the simple subject in the following sentence:
The space shuttles have made travel to the International Space Station convenient and possible.
First, the whole subject is "the space shuttles" and the head of this phrase is B. shuttles - that's the correct answer</span>
Yes it is.
I apologize if it is wrong!
He has mixed feelings as he is probably tired of getting work and is being given more and becoming lazy
He’s happy as if he does well it will benefit him
The answer is “B” because the Scientific were experienced in the real world.