An activist is someone who
passionately believes in a cause
has no interest in supporting a cause
actively discriminates against others
makes a living from giving speeches

The correct answer is A. Passionately believes in a cause

Explanation:

The word "activist" refers to a person tht is part of an activist movement or a movement that aims at achieving some social change which is usually referred to as a cause. Additionally, this cause or social change activists pursue can be linked to multiple areas including environment, politics or economy and involve different strategies to support the cause they believe in such as strikes, marches, protests, pamphlets, among others. Moreover, in most cases, activists create organized actions to support the cause they follow and can even continue with actions despite the opposition from government or society as they strongly or passionately believe in the idea or change they are defending. Thus, an activist can be defined as someone who passionately believes in a cause.