Thank you vey much for your explanation. I understand most of your explanation.
Could you please explain the meaning of your sentence:
It's a stylistic choice. I wouldn't write it, because if you read it aloud, the apostrophe won't be heard, and a listener might think I'm comparing our lives with our grandparents. Also, a reader might miss the apostrophe and be confused for a second.
The original sentence and choices are as follows:
If there is one main characteristic of the modern world that makes our lives different from _________ it is probably speed.
a. that of our grandparents b. those of our grandparents c. our grandparents ( This is what I add now). Could you please explain if you think 'c' is correct?
Looking forward to hearing from you.
Thank you in advance.