Correct Answer: Faith

Solution : The first option is the correct answer.

Belief refers to a conviction or acceptance that something is true or exists. Faith means confidence or trust in a person, thing, or concept, often associated with religious beliefs or strong convictions.

The meanings of other options are as follows:

• A promise is a commitment or assurance to do something.

• A system is a set of principles or procedures; it is an organised or established procedure or method.

• Religion is a set of beliefs and practices centred around the worship of a higher power or divine being.

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Therefore, the correct answer is faith.