WAEC Further Mathematics 2021 Question 37

Given that f: x → x² − x + 1 is defined on the set Q = {x: 0 ≤ x < 20, x is a multiple of 5}, find the range of f.

1. A.{21, 91, 211}
2. B.{21, 91, 211, 381}
3. C.{1, 21, 91, 211}
4. D.{1, 21, 91, 211, 381}