Talking about salary with colleagues can be uncomfortable, since there's such a taboo about discussing money matters, but it's an important step towards achieving equal pay for equal work.

分析：本句是一个复合句。“Talking about salary with colleagues”是动名词短语作第一个分句的主语；since引导原因状语从句。

译文：和同事谈论薪金会让人不舒服，因为谈论钱的事情是一个禁忌，但是这是朝着实现同工同酬目标迈进的重要一步。

What makes co­workers uncomfortable to talk about salaries?

A．The safety issue.

B．The labor law.

C．The wrong idea about salaries.

D．The reflection of their worthiness.

解析：C　考查推理判断。根据第三段第二句“One barrier, however, stems from how we think of our own financial worth”和对第三段的整体理解可推知，对薪金的错误看法导致同事间谈论薪金时感到不舒服，故选C项。