Step 1: Concept Explanation:
The question requires identifying the figure of speech in the given phrase. Here's a review of the options:\[\begin{array}{rl} \bullet & \text{Oxymoron: Combines contradictory terms (e.g., "living dead").} \\ \bullet & \text{Allegory: A narrative with a symbolic hidden meaning.} \\ \bullet & \text{Onomatopoeia: Words imitating sounds (e.g., "buzz," "hiss").} \\ \bullet & \text{Alliteration: Repetition of the same initial consonant sound in consecutive words.} \\ \end{array}\]
Step 2: Detailed Analysis:
Analyzing the phrase: "Shimmering snow on the southern slope of the Simla hills."\[\begin{array}{rl} \bullet & \text{The 's' sound is repeated at the beginning of several adjacent words: Shimmering, snow, southern, slope, Simla.} \\ \bullet & \text{This repetition of an initial consonant sound defines alliteration.} \\ \bullet & \text{The phrase lacks contradictory terms (not oxymoron), a hidden story (not allegory), and sound-imitating words (not onomatopoeia).} \\ \end{array}\]
Step 3: Conclusion:
The phrase exemplifies alliteration. Therefore, option (D) is correct.