Which best explains how imagery contributes to the meaning of this
passage?
A. It lists the different forms of protest to illustrate the creativity of
the protesters
B. It explores the narrator's emotions to highlight the cruelty of the
protests.

C. It describes the crowd as a parade to show the eventful
atmosphere.

D. It brings to life the sound and appearance of the crowd and
conveys their anger.

D

Explanation:

I believe it would be D.

Explanation:

It says hot angry tangle of shaking fists and ugly words that threatened us like a monster with a hundred heads.

It creates an image in your head of furious people, and conveys their anger.

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.