The correct answer is C. recognition of.
In order to thoroughly appreciate something, first of all you need to have a particular knowledge about the subject. Then you need to observe it thoughtfully and come to your own conclusion. In the end, you need to recognize its value, regardless of whether you like it or not.
a source of social interaction through verbal and non-verbal communication.
I'm pretty sure that it's D. In addition
Ana is the simple subject.
subject predicate
My sister's friend Ana/plays soccer.
It's b) as extremely might be a infinitive phrase
