Step 1: Recall the throwing circles:
In athletics, the throwing events use circles of set size. The shot put and hammer circles are 2.135 m across. The discus circle is a little bigger because the thrower spins to build speed.
Step 2: Read off the value:
The discus circle diameter is 2.50 m, or 250 cm.
Step 3: Match with the options:
Only option 2 equals 2.50 m. The values 2.30 m, 2.40 m and 2.60 m are not used for any of these circles.
Final Answer:
The discus circle is 2.50 m wide, so option 2.
\[\boxed{2.50\ \text{m}}\]