In the following four statements, please choose an effective thesis statement.
A.
There are eight planets in the solar systems.
B.
Why should every college student be required to study a foreign language?
C.
The question of whether we need a national law governing the minimum age to drink alcohol is a controversial issue in many countries.
D.
Contrary to common sense, wearing a helmet while riding a bicycle increases the chances of injury, at least to adult riders.