The risk factors that you can control among the options provided are related to your own behavior and lifestyle choices.
Out of the statements mentioned:
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Your friends have recently started smoking. - This is not directly under your control, but you can choose whether or not to smoke.
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There is a higher incidence of high blood pressure in your ethnic group. - This is an uncontrollable risk factor as it is related to genetics and ethnicity.
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There is a history of heart disease in your family. - This is also an uncontrollable risk factor as it pertains to family genetics.
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Unintentional accidents are the leading cause of death for teens. - While this is a statistic and reflects risk, you can control your actions to reduce the risk of accidents (e.g., safe driving, avoiding risk-taking behaviors).
Among these, the most directly controllable factor is your response to your friends smoking, as you can decide whether or not to engage in the same behavior. However, as none of the items explicitly mention a controllable behavior, be aware that while you cannot control the fact that your friends smoke, you can control your own choices regarding smoking.
Therefore, the best answer regarding a controllable risk factor would relate to your own choices in similar situations.