单选题：WhydidTynelluseoxidematerialsinmakingnewthermoelectricmateri

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题目内容：

WhydidTynelluseoxidematerialsinmakingnewthermoelectricmaterials? A．Becausetheyarethemostpromisingthermoelectricmaterials.
B．Becausetheyarenotexpensive,highlyefficientandeasytoget.
C．Becausetheydonoharmtotheenvironmentandhavegoodavailability.
D．Becausetheyhavebeenprovedtobeusefulindevelopingsustainableenergytechnologies.

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