To solve this, check the number of Vibhags (divisions) in each Tala:
Teentala: 16 beats, divided as 4 Vibhags of 4 beats each. So, 4 divisions.
Ektala: 12 beats, but has 6 Vibhags (2+2+2+2+2+2) — so more divisions than Teentala.
Sooltala: 10 beats with 5 Vibhags (2+2+2+2+2).
Tevra: 7 beats with 3 Vibhags (3+2+2).
So in increasing order: Tevra (3) → Teentala (4) → Sooltala (5) → Ektala (6).
Accordingly, the correct order is (a) Teentala, (b) Ektala, (c) Sooltala, (d) Tevra.