The word "histrionic" is given in bold. Choose the option in which the pair of words correctly gives synonyms of "histrionic".

Introduction / Context:
This question tests advanced vocabulary by focusing on the word "histrionic". The task is to choose the pair of words that are synonyms of "histrionic". Such questions require not only a basic understanding of the word but also the ability to connect it with related terms describing similar behaviour or style.

Given Data / Assumptions:

• The target word is "histrionic".
• Four options are given, each a pair of words.
• Exactly one pair should give correct synonyms.
• The context of use of "histrionic" is usually behaviour or acting style.

Concept / Approach:
"Histrionic" usually describes behaviour that is overly dramatic, exaggerated, or theatrical, often to attract attention. It can refer to acting that is too showy or emotional displays that seem insincere due to their intensity. Therefore, words like "melodramatic" and "theatrical" fit naturally as synonyms. When checking the options, focus on whether the pair suggests exaggerated drama or something else entirely.

Step-by-Step Solution:
Step 1: Fix the meaning of "histrionic" as overly dramatic and theatrical. Step 2: Look at option A, "Melodramatic, Theatrical". "Melodramatic" means exaggerated or overly emotional, especially in a way that resembles melodrama. "Theatrical" means related to theatre or behaviour that is showy and dramatic. Step 3: Look at option B, "Conscientious, Diligent". These words describe careful and hardworking behaviour, not exaggerated drama. Step 4: Look at option C, "Tenacious, Retentive". "Tenacious" means persistent or determined, and "retentive" refers to having a good memory or the ability to hold things. These are unrelated to dramatic display. Step 5: Look at option D, "Thrive, Tussle". "Thrive" means to prosper, and "tussle" means to struggle or wrestle. They do not connect to dramatic behaviour. Step 6: Clearly, only option A contains words that match the sense of "histrionic".

Verification / Alternative check:
Imagine a sentence like "The actor performance was too histrionic for this subtle play." Replacing "histrionic" with "melodramatic" gives a very similar meaning: "The actor performance was too melodramatic for this subtle play." Replacing it with "theatrical" also keeps the sense of exaggerated acting. Replacing "histrionic" with any of the words from the other options would produce sentences that no longer fit the context of emotional overacting, confirming that option A is the correct choice.

Why Other Options Are Wrong:
Option B is wrong because conscientious and diligent are traits of a careful, hardworking person, not someone who overacts. Option C is wrong because persistence and retention are unrelated to emotional drama or performance style. Option D is wrong because prospering or struggling physically does not say anything about dramatic behaviour. None of these other word pairs can be used naturally in the same contexts where "histrionic" would be used.

Common Pitfalls:
A common mistake in such questions is to pick words that sound impressive or complex but are not meaningfully related. Many candidates also focus on one word in the pair and ignore the second, but you must evaluate the pair as a whole and make sure it fits the definition of the target word. To avoid errors, always try to think of a sample sentence with the target word and see which options can replace it without breaking the sense of the sentence.

Final Answer:
The correct pair of synonyms for "histrionic" is Melodramatic, Theatrical.