Each section in the first year of plus 2 courses has exactly 40 students. If there are 5 sections, in how many ways can a set of 4 student representatives be selected, 1 from each section?

The correct option is A 2560000
1 student representative can be selected from section I in 40 ways.
1 student representative can be selected from section II in 40 ways.
1 student representative can be selected from section III in 40 ways.
1 student representative can be selected from section IV in 40 ways.
Hence, the number of ways in which a set of 4 student representatives can be selected $=40\times 40\times 40\times 40=2560000.$