Which is a product comparison?

reviewing two current popular novels and recommend one

comparing two video games and the advantages of each

describing two local parks and what to do at each of them

explaining how to download and play a popular video game

Ineed quick me on this one and others

The greatest gift the sumerians gave the world was the invention of writing. the sumerians were 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.

Use a subordinate conjunction to combine these two sentences into one sentence. the journalist met a source at the hotel. this way he would get facts for an article.