Class (2) of Senior One held a speech contest of "I Love My Motherland". There were three contestants A, B and C in the contest, and the class teacher asked the three contestants to draw lots to decide the speech order.
Draw a tree:
∫ * * There are six possible outcomes, and 1 happens to be A, B and C that arrive from the first one.
The probability that the first one is A, B and C is: 1 6.
So choose D.