Question: The angular methods for evaluating the flow properties of pulverulent solids allow the determination of the angle of repose parameter. A mixture of pulverulent substances presents a good or optimum flow if the values ​​of this parameter (in degrees) are: 
 Options:  <1> Over 40 <2> Between 45 and 55 <3> Between 38 and 45. <4> Over 37 <5> Near or under 25
5