Correct option is B
Given:
Treena reached the office before Dev but after Loki.
Veer reached the office before Treena but after Kiran reached the office.
Loki reached the office just after Veer reached the office.
From the given information arrangement will be.
Kiran > Veer > Loki > Treena > Dev
Dev reached the office last.
Thus, correct option is (b).