Read the dialogue and answer the question.
Ali: I read that scientists discovered a new planet.
Zeynep: Really? How did they discover it?
Ali: First, they used a powerful telescope to observe the sky. Then, they made a guess about its path. After many more observations, they saw that their guess was correct and announced it as a new planet.
Zeynep: So their guess was right?
Ali: Yes, the observations supported it.
Which of the following is TRUE according to the conversation?
A)The scientists made a guess after they announced the planet.
B)The scientists used a telescope to test their guess.
C)The scientists observed the sky before making a guess.
D)The scientists concluded that their guess was wrong.