Final answer:
The numbers that indicate a regional alliance are (E) II and III.
Step-by-step explanation:
II (15) and III (17) are prime numbers that indicate a regional alliance as they are only divisible by 1 and themselves, symbolizing a group or alliance that stands independently without further divisible entities. However, I (12) is not a prime number as it can be divided by numbers other than 1 and itself (2, 3, 4, 6), suggesting it doesn’t represent a regional alliance.
In the context of alliances, prime numbers serve as a metaphor. Just as prime numbers can't be divided into smaller whole numbers, a regional alliance consists of specific entities closely bound together without external divisions or influences. Therefore, II and III align with the idea of a regional alliance due to their indivisible nature, while I does not fit this criterion.
The correct answer, once more, is E) II and III.