A study investigates the effectiveness of a new safety helmet for cyclists. Out of $1800$ cyclists not wearing the new helmet, $27$ suffered serious head injuries. Out of $5400$ cyclists wearing the new helmet, $9$ suffered serious head injuries. At the $0.05$ significance level, test the claim that the new helmet reduces the risk of serious head injury. What does the result suggest about the effectiveness of bicycle helmets?

• A. The result suggests that the new helmet is effective in reducing serious head injuries for cyclists at the $0.05$ significance level.
• B. The result suggests that the new helmet is not effective in reducing serious head injuries for cyclists at the $0.05$ significance level.