Which method is appropriate for separating a mixture of iron and aluminum? a. using a magnet b. distillation c. evaporation d. observing different densitie

Appropriate method for separating a mixture of iron and aluminum is definitely A. using a magnet. If we use the second method we will vaporize either aluminum or iron.
If we used the third method it  would  change liquid into a gas which is strange according to the task.
And observing (even for a long time) won't help separating. 

Butterfly wingspan is 7.7

The answer would be true