Answer:
B). Attending communication workshops may help advance your career.
D). The director of customer service was unaware that accounting had automated billing.
Step-by-step explanation:
Word-choice always play a vital role in conveying the intended meaning of a specific message or idea. The use of simple and familiar words help communicate with a wider audience sharply while intricate and complex words are employed to address an educated audience(of that particular domain).
As per the question, options B and D appropriately employ the plain English and standard words as they convey the desired idea precisely in a compact form. This is reflected by the use of active voice and explicit yet specific message like 'attending communication workshops may help to advance your career' that explicitly states the intended idea without fabricating or complicating it. 'The director of.....billing' also portrays the idea clearly and directly with the use of simple and usual words. The other two options fail to present the idea in a simple yet familiar language.