Final answer:
The subject of this question is Mathematics, and it specifically refers to the concept of 1. Frequency. It involves counting the number of times a natural disaster occurs during a given time period.
Step-by-step explanation:
The subject of your question is Mathematics and specifically the concept of 1. Frequency. Frequency refers to the number of times a natural disaster occurs during a given time period. It represents a quantitative discrete measure, which means that it involves counting the occurrences of a specific event.
For example, if we are tracking the frequency of earthquakes in a particular region, we would count the number of earthquakes that occur during a specific time span (e.g., a year).
The other options given (Magnitude, Intensity, Occurrence) are not specific to the number of times a natural disaster occurs, but rather describe different aspects such as the strength, size, or occurrence pattern of the disaster.