Explanation:
its shows how memories are sometimes good or sad
The pollution of the Kathmandu Valley is believed to be out of control by the environmentalist.
<h3> Or it may be </h3>
It is believed that the pollution in Kathmandu Valley is out of control by environmentalist
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.
Although both B and C would support the argument, I believe the correct answer in this case would be A.
D. It will highlight the historical significance of bicycles for women.