Distinctive has a positive connotation.
~ Tension is how much the reader care's about your characters. If the reader doesn't like your characters, enjoy spending time with them, or care what happens to them, that's what editors call, "Lacks Tension." Believe me. I've had enough return letters to prove it.
Suspense is how much readers care what will happen next? If you keep them guessing, that's suspense.
Answer: I believe it’s A.
Explanation: it explains difficulties that astronauts may face and in the following sentence it goes more in depth
