I'm not sure what it is asking I'm assuming it's if our vehicles were made safer all our road safety problems would be solved. This is incorrect! Because of reckless drivers or people who are just learning how to drive etc. etc.
The correct answer among all the other choices is 'Their desserts are so rich, my sister and I usually share one among us.' This <span>sentence uses the word among incorrectly </span>Thank you for posting your question. I hope this answer helped you. Let me know if you need more help.
A demand is like i want this done now and a request is like can you do this for me