I think it's <span>A. Arab military conquest</span><span />
Charles x became the King in France in the year 1757_1836
<span>It hired professional soldiers called mercenaries to conquer the lands.</span>
<span>the development of written language helped unify China by, because everyone had the same written language, no matter where you were from and what dialect you speak you could understand anyone's writing.
Hope this helps!!! :)</span><span />