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The correct answer is C. There are three issues available in describing degree of belief:
- Probability is a measure of the likelihood of an event occurring. It is often expressed as a number between 0 and 1, where 0 indicates that the event is impossible and 1 indicates that the event is certain.
- Belief is a subjective measure of how likely someone thinks an event is to occur. It is often expressed on a scale from 0 to 100, where 0 indicates that the person does not believe the event will occur at all and 100 indicates that the person is certain that the event will occur.
- Certainty is a subjective measure of how confident someone is in their belief. It is often expressed on a scale from 0 to 100, where 0 indicates that the person is not at all confident in their belief and 100 indicates that the person is completely confident in their belief.
It is important to note that probability, belief, and certainty are not the same thing. Probability is a measure of the likelihood of an event occurring, while belief and certainty are measures of how likely someone thinks an event is to occur and how confident they are in their belief, respectively.
For example, someone might believe that there is a 50% chance of rain tomorrow, but they might only be 75% certain of their belief. This means that they think it is likely that it will rain tomorrow, but they are not completely confident in their belief.
It is also important to note that probability, belief, and certainty can change over time. For example, someone might believe that there is a 50% chance of rain tomorrow, but if they see that the weather forecast has changed to a 70% chance of rain, they might become more confident in their belief.
In conclusion, there are three issues available in describing degree of belief: probability, belief, and certainty. These are not the same thing, and they can change over time.