Which city or cities have summer in July? Which city or cities only have two seasons?
Which city or cities are relatively warm year-round?
Which city or cities have 24 hours of daylight during the summer?
Which city or cities have summer in January?

1. Phoenix and Las Vegas
2. Manaus
3. Long Beach, Calif
4. Abisko, Sweden
5.San Diego, California%72

answer; ///(streak) is the correct answer

d. new methods of assembly are introduced.

explanation:

this allows for the goods to be made on a larger scale. not faster because now it is shown to be made better, hence the greater productivity in the question. it is calling for something new to be introduced.