test question
 

For which of the following phases of flight may forecast
temperatures (as opposed to actual or reported) be used in assessing
performance?
(i) Take-off.
(ii) En Route.
(iii) Landing.
a. 1 and 3.
b. 1 and 2.
c. 2 and 3.
d. All of the above.

Thank you all

As someone said in your other post, the question isn't written very well. Think about it, you have current temperature for TO. All you have for enroute and landing are forecast. The only answer that does not have TO in it is "c."