In the series of chemical elements F → CL → Br → I, oxidizing properties a) increase

In the series of chemical elements F → CL → Br → I, oxidizing properties a) increase b) decrease c) do not change d) increase, and then weaken

These elements are in different periods of the periodic system of D.I. Mendeleev: F – 2 period, Cl – 3 period, Br – 4 period, I – 5 period. Since the periods in the given chain grow, then, according to the patterns of arrangement of elements in the periodic system, the oxidizing properties of the elements decrease from top to bottom, from the smallest period to the largest.
Answer: in the given chain of elements, oxidizing properties decrease, option b).