It's B. Past. The other ones don't really make sense.
Yes, it is true that people all over the world are alike despite our outwards differences. While we may look different, think different, act different, et cetera, we are all connected by one thing: our human bond.
"There is so much more that we have in common than what separates us." ~Kamala Harris, current vice president of the United States of America.
That's how we are united. That's how we can bring peace and love to the world.
