An example of a community on the Internet geared toward fun is: A. playing basketball with neighborhood friends.
B. raising money to buy livestock for poor families.
C. joining in with friends on a blog about movies.
D. asking others to support a political candidate.

C

Explanation:

Since it is towards fun it would be a blog with friends about a movie.

the present continuous is a verb tense which is mainly used to indicates that an action is in progress at the moment of speaking.  

it is formed using: person + verb to be (am/is/are) +verb + - ing form  

example: i am studying at this moment .

in addition, the present continuous is also used in order to express things that will or will not happen in the near future.

example: i am having dinner with some friends tonight.

the speaker sometimes   uses it   to express that an action is repeated and it causes irritation on the part of the speaker

example: my sister is constantly complaining about everything.

answer by yourhope:

hi! : )

which answer best describes the interaction between the elements mentioned in the excerpt?

b. an individual influencing an idea!

: )