Can someone me with this vocabulary questions

Which of these can an adverbial clause modify?

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.

If the poem is about going mad when love is lost, what would happen if love didn’t die? identify the independent clause. a if the poem is about going mad when love is lost b if love didn't die c what would happen d when love is lost