求助关于强调句型与定语从句混合使用一道题目==somegreatpeoplesaiditwastheirprimaryschoolteachersandtheirlessons----theywerefondof-----influncedtheirwholelivesAwhich;thatBthat;whichCwhich;whichDthat;that谁

　　求助关于强调句型与定语从句混合使用一道题目==

　　somegreatpeoplesaiditwastheirprimaryschoolteachersandtheirlessons----theywerefondof-----influncedtheirwholelives

　　Awhich;thatBthat;whichCwhich;whichDthat;that

　　谁能解释一下哪句是定语从句,哪句是强调句以及答案为什么选这个?