In the following question, out of the four alternatives, select the alternative which is the best substitute of the phrase.to expel someone from a position or place.

Let's check the definitions of the words:To oust: To drive out or expel someone from a position or place.To disinherit: To decide that someone will not receive any of your money or property after you die.To chase: To pursue in order to catch or catch up with.To relegate: To assign an inferior rank or position to.Therefore, to oust is the perfect fit for the given phrase.