Umm... I'm confused between a, and d can someone please clarify this practice?

Is the following statement true or false? the topic sentence of a paragraph should indicate what the paragraph is going to be about. false true

The greatest gift the sumerians gave the world was the invention of writing. the sumerians were a wealthy people. they needed some way to keep track of what they owned. they began drawing pictures. they used a reed as a pen. they drew on soft pieces of clay. the soft clay was then dried in the sun. the tablet became a permanent record. later, the sumerian drawings changed into wedge-shaped symbols. this kind of writing is called cuneiform. by putting symbols together, the sumerians could write entire sentences.

Which form does a verb take when the subject receives the action?