Synonyms

Abandon is a word of wide signification, applying to persons or things of any kind; abdicate and resign apply to office, authority, or power; cede to territorial possessions; surrender especially to military force, and more generally to any demand, claim, passion, etc.

The synonym of TACITURNITY is Reserve.

Massacre: an indiscriminate and brutal slaughter of people.
Slaughter: the killing of a large number of people or animals in a cruel or violent way; massacre.
The synonym of MASSACRE is Slaughter.

Rabble is a synonym for mob in crowd topic. In some cases you can use "Rabble" instead the word "Mob" as a noun or an adjective, when it comes to topics like people, masses, hoi polloi, large group of people.

An impromptu action is one that you do without planning or organizing it in advance.

The given word 'ponder' means 'to consider something deeply or thoroughly', 'thinking about something carefully'.
From the options, Option A: 'think' best expresses the meaning of the given word. Hence option A is correct.
Option B: 'Evaluate' means 'to determine or set the value or amount of'.
Option C: 'Anticipate' means 'to expect something or foresee it'.
Option D: 'Increase' means 'to make greater in number, size, or quantity'.