___________,he has earned himself a lot of respect , yet he is always modest and accessible.A. With his all profound knowledgeB. With all his profound knowledgeC. Through all his profound knowledgeD. By all his profound knowledge

步骤 1：分析句子结构
句子的主干是“he has earned himself a lot of respect”，表示“他赢得了很多尊重”。后半句“yet he is always modest and accessible”表示“然而他总是谦虚且平易近人”。前半句需要一个介词短语来修饰主句，表示原因或方式。

步骤 2：分析选项
A. With his all profound knowledge：介词短语结构错误，应为“With all his profound knowledge”。
B. With all his profound knowledge：正确，表示“凭借他所有的渊博知识”。
C. Through all his profound knowledge：介词使用错误，应为“With all his profound knowledge”。
D. By all his profound knowledge：介词使用错误，应为“With all his profound knowledge”。

步骤 3：选择正确答案
根据句子结构和选项分析，正确答案是B。