A small settlement formed along the Tigris River following the Neolithic Revolution. As the settlement grew, it developed complex social institutions
and people began to specialize at certain jobs. What other development does
the settlement need to be considered a civilization?

Historians believe that these six components of a civilization are cities, government, religion, social structure, writing and art. These are most commonly found in each civilization found throughout the ages, or at least some variation of them all. I would assume it would need a genuine culture and a governing system. If you think I'm wrong feel free to correct me, but I am a bit of a history nerd!

your list doesn't mention any of them at all.

and what does "these" mean anyway ?

the fact that could also be added to column b is that during world war ii, specifically between the years 1941 and 1945, japan expanded its territory towards the indonesian territory in what was known later as part of the "pacific war". in that time, japan could conquer the philipines, singapore,   borneo, central java, malang, cebu, sumatra and various other islands of the area, therefore expanding its territory for a brief period of time.