Do you think you can expand your question to see if j can respond to this?
I think it’s all of the above
For the first red, you don't need an article before "relationship".
When you're saying "type of [word]", do not put any article before that word.
Example: "a type of device"
Not too sure about the "your back" parts. It could be your teacher does not like repition.
Also not too sure about "did". He probably wanted you to use the word "felt" instead of "did feel"
The first word of the last paragraph should be "in" not "at".
The red commas definitely do not need to be there.
Don't know why he marked "time to" and "to" red.
Answer:
Part A: by listing jobs created by solar and explaining how workers with earnings to spend help businesses
Part B: “Workers will have to build solar panels. Truck drivers will have to deliver them. Some technicians will have to install them. Others will have to maintain them. All of these people will earn good wages. And as they spend those wages, they will support other businesses. That will create a positive economic ripple effect.”