Answer:
The correct answer would be option A, You should only request a connection if you know the person.
Step-by-step explanation:
There are many social media websites which are basically the networking websites. Some websites are meant for making friends and increasing the social circle, whereas some websites like LinkedIn are meant to connect people with each other professionally. These are considered the high level networking websites. So in such type of professional websites, if you know someone or if you have an acquaintance with someone, you should then send him the request, otherwise you are likely not to get the reply from that person.