Final answer:
The opposite of a number is the number with the opposite sign. Without a specific number after the negative sign in your example, we cannot determine an accurate answer from the provided options.
Step-by-step explanation:
The opposite of a number is the number with the opposite sign. So, the opposite of 5 is -5, and the opposite of 12 is -12. In your example, the opposite of - is not provided with a specific number. However, based on the pattern provided in your examples, if we were to find the opposite of a negative number, we would change it to a positive. So if the number were -5, the opposite would be 5 (option a). If the number were -12, the opposite would be 12 (option c). Without a specific number provided, we cannot determine a correct answer from the options given.