The correct answer is D. If you take action, and you do not understand what you are doing, you can cause more harm than good.
<span>The western-most lands conquered by the Achaemenid Empire extend into what is now modern-day Egypt and Libya. Most of the lands conquered under Cambyses fall in Egypt, while they were extended further into Libya under Darius I.</span>
Since humans tend to go through changes in periods over decades, and even centuries, it often makes little sense to give exact dates for every single instance of events. It is also a way for historians to put a general time period on an event. For example, we know that bronze became a product a long time ago, but we define its height of use during the Bronze Age. It helps generalize the 8,000 years of recorded history that historians sort through.