Discussion

Explanation:

Option (a): Let p = 10, q = -5, r = -2 and s = -3
Now, pr = -20 while qs = 6
∴ pr < qs
⇒​​​​​​​ option (a) is not necessarily true

Option (b): Let p = 10, q = -5, r = -2 and s = -30
Now, p - r = 12 while q - s = 25
∴ p - r < q - s
⇒​​​​​​​ option (b) is not necessarily true

Option (c): This is a standard result.

Hence, option (c).
 

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