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C. Doctors recommend 2-3 hours of exercise a week.

Explanation:

Facts are usually things which have concrete evidence or tend to have some form of data (without opinions most of the times) to support it.

Here A, B, D all have opinionated statements whereas, C lists out a fact well-known in medical and/or nation-wide communities.

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.

are you gay

explanation: