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(A) at
(B) on
(C) in
(D) for

have an effect on something。
Regular exercise can have many beneficial effects on your health.
（規律運動對你的健康會有許多有益的影響。）

資料來源：https://www.hopenglish.com/affecteffect

“Eating less has a more profound深遠的 effect on the aging process than does any other life-style change,” says a professor at the University of Texas Health Science Center. “It is the only factor we know of in laboratory animals that is an anti-aging factor.”

“與任何其他生活方式的改變相比，少吃對衰老過程的影響更為深遠，”德克薩斯大學健康科學中心的一位教授說。 “這是我們在實驗室動物中所知道的唯一一個抗衰老因素。”