This definition excludes many individuals usually referred to as intellectuals – the average scientist, for one. I have excluded him because, while his accomplishments may contribute to the solution of moral problems, he has not been charged with the task of approaching any but the factual aspects of those problems.

Question

Average scientist is excluded from intellectuals because ______.

A 错误：he offers no effective solution to moral problems
答非所问：A选项近似于while从句的信息，这是原因状语中的让步部分，并非核心原因
偷梁换柱：让步状语部分说明“虽然有助于解决道德问题”，并非“一无是处”，因此该选项中的完全否定词“no”属于误用。

B 正确：he only deals with factual aspects of moral problems
合理代换：

• only = not …any but …
  

• approaching = deals with
  

• factual aspects of moral problems = factual aspects of those problems