Final answer:
The correct reciprocal pronouns to fill in the blanks are 'each other' and 'one another', which are used to describe mutual actions between two or more subjects, and these terms are often used interchangeably.
Step-by-step explanation:
The correct answer is B: each other, one another, each other. Reciprocal pronouns are used when two or more subjects are acting in the same way towards each other. The phrase 'each other' is typically used when referring to two subjects, while 'one another' is used for more than two. However, in modern English usage, these two terms have become somewhat interchangeable. In practice, the important thing is that reciprocal pronouns emphasize the mutual or reciprocal action between subjects.
In the sentence 'Rhetorical situation and purpose affect each other throughout one another a speech. In fact, all the elements of speechmaking interact with each other.', we are discussing how the components of a speech (which are more than two, hence 'one another') interact with and affect one another throughout the speech and they ('each other') all interact mutually.