Pleas hel m a lot of piont

Some people think that English is a hard language to learn, but experts disagree. They say that no human language is more or less difficult than any other. All babies learn to speak the language of their parents very quickly. Most babies learn to walk by the time they are a year old. They learn that it's easier for them to get what they want if they can speak. A baby born to parents who speak English will learn English as quickly as a Japanese child whose parents speak Japanese. Of course, experts agree that learning a second language can be much harder.

What is this passage mostly about?
A.
how English is a harder language to learn than Japanese
B.
how learning a second language is incredibly hard to do
C.
how babies can learn the language of their parents very quickly
D.
how no human language is more difficult to learn than any other