Which sentence explains how the central idea FIRST emerges in the passage? А
It becomes evident through the use of humor in the first paragraph.
B
It is introduced through specific examples in the second paragraph.
С
It is stated in the advantages listed at the start of the third paragraph.
D
It is implied by the questions asked at the end of the third paragraph.

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.