GMAT Critical Reasoning (CR) | Re: In Wareland last year, 16 percent of licensed drivers under 21 and 11

Someone please explain how B is incorrect.

Drivers 65 and older do not constitute a significantly larger percentage of licensed drivers in Wareland than drivers ages 18-24 do.
Yes, if we negate this, and take this scenario.

total licensed drivers-1000
65 and older- 700
under 24- 100
others-200

3% of 700, is ~20
10% of 100 is ~10

So there are more number of older drivers who are involved in serious accidents which breaks the argument that they are safer