单项选择题

The employer’s failure to protect its employees against smoking causes an employee to quit her job.

A．该雇主未能成功地保护其雇员免受吸烟之害，由此导致一位雇员辞职。
B．由于该雇主未能保护其雇员免受吸烟之害而导致一位雇员辞职。
C．由于该雇主未能成功地禁止其员工吸烟，因而导致一位雇员辞职。
D．为防止员工辞职该雇主发起禁烟运动但最终失败。
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