Topic: Degree of Comparison,

Best Answer Explained in Below-:

The correct choice is B: "This is the wiser plan of the two." It employs the comparative form of the adjective "wise," which is "wiser," making it appropriate for a direct comparison between two plans. In essence, when comparing two items or ideas, the comparative form enhances clarity by indicating that one is superior to the other without implying an absolute superiority.

Here's a breakdown of the other options:

- A) "This is the wisest plan among the two" is incorrect because "among" is typically used for three or more items. Thus, "between" is more suitable when discussing just two options.

- C) "This is the wisest plan of the two" uses the superlative form "wisest," which is inappropriate since it suggests a ranking among several options rather than a comparison of just two.

- D) "This is the wiser plan between the two" is grammatically correct, but it is less common in formal usage. "Between" usually works, but "of the two" flows more smoothly in this context.

Overall, B effectively communicates the comparison while adhering to grammatical conventions, making it the clearest and most correct choice.