The correct answer is **the... the...the** (Option 3). **Comprehensive Derivation:** The correct answer is - "the.. the.. the.." Explanation & Key Takeaways: • From the given options, the most appropriate answer is "the.. the.. the.." • Definite Article "The" is used before things which are particular or specific plural nouns. • The is used before definite nouns towards which we can point out that we can visualize or that has already introduced. • Example - The sun, The fort, etc. Neil Armstrong was the first man to walk on the moon. • Here, in the 1st blank, preserve needs "the" article before it as preserving specific class "elite class" is being talked about. • 2nd blank: Elite defines a select group that is superior in terms of ability or qualities to the rest of a group or society. Thus, article "the" will be used here. • Mobile phone is being specifically talked about. Thus, article "the" will be used here. Complete sentence: Once the preserve of the elite, the mobile phone is now ubiquitous, as there are millions of subscribers. **Option Elimination:** • **Option 1 (No article required... the ... a)**: Incorrect distractor. • **Option 2 (the... an... the)**: Incorrect distractor. • **Option 3 (the... the...the)**: Correct Answer; accurate according to canonical reference. • **Option 4 (No article required... an... a)**: Incorrect distractor. **Exam Trap:** Be careful of misleading distractors and subtle terminology differences. Verify core properties before selecting your answer. **Memory Booster:** Core mnemonic rule: the... the...the corresponds to Option (3).