Answer: 1. any agent that acts as a carrier or transporter
Step-by-step explanation:
The correct answer is 1. any agent that acts as a carrier or transporter. It is the correct answer because in this case ''A way to compare to others'' can mean that someone is having a force on influence on some other people. That is why that person can act as a transporter or carrier. Since he is comparing himself to other people, he will also try to copy them because he has a force on influence.
The word ''vector'' can represent many things and it is depending on the context where the word is used.