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以下句子,强调的主题是研究者的活动的是。

(A)ThecausesofLidendriteformationinLi-metalbatterywereinvestigatedbyJones.

(B)TherehavebeenseveralinvestigationsintothecausesofLidendriteformationinLi-metalbattery.

(C)SomeresearcheshavestudiedthecausesofLidendriteformationinLi-metalbattery.

(D)ThecausesofLidendriteformationinLi-metalbatteryhavenbeenwidelyinvestigated.

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