Three ways to separate mixtures

This task is about ways to separate mixtures of different things.
 
sieve magnet pot-820012_640pot-Republica from Pixabay.png
With a large sieve With a magnet By evaporation
 
A teacher mixed different things together. Choose the best way to separate each mixture from the list above. The first one is done for you.
  
Mixture Best way to separate the mixture
a) Rocks and soil. With a large sieve.
b) Sugar and water.  
c) Flour and peanuts.  
d) Metal paper clips and plastic paper clips.  
e) Salt and water.  
f) Metal needles and sawdust.