The correct answer is: Always.
Always means at all times, without exception. It is used to describe something that is done or happens without fail. For example, “I always brush my teeth before bed.”
Disallow means to refuse to permit or allow something. It is used to describe something that is not allowed or permitted. For example, “The teacher disallowed the students from using their phones during the test.”
Never means on no occasion or at no time. It is used to describe something that does not happen or is not done. For example, “I never lie.”
Daily means happening or done every day. It is used to describe something that happens or is done on a regular basis. For example, “I take a shower daily.”
Descend means to move or go down from a higher to a lower place. It is used to describe something that moves or goes down. For example, “The airplane descended from the sky.”
In the context of the question, “Always” is the correct answer because it is the only option that describes something that is done or happens without fail. The other options, “Disallow,” “Never,” and “Daily,” do not describe something that is done or happens without fail.