Directions (101-102): In each of the following questions, a sentence has been divided into four phrases. These phrases may or may not have been placed in their correct positions. Identify the correct rearrangement of the phrases to make the sentence grammatically correct and contextually meaningful, and mark that option as your answer.

mystery and wonder, with billions of (A)/ a burning beacon of light in the vastness of space (B)/ the universe is an endless expanse of (C)/ galaxies and trillions of stars, each one (D)

The correct rearrangement option is CADB.

Let's analyze the given phrases to construct a grammatically correct and contextually meaningful sentence:
(A) mystery and wonder, with billions of
(B) a burning beacon of light in the vastness of space
(C) the universe is an endless expanse of
(D) galaxies and trillions of stars, each one

Step-by-step logical reconstruction:

1. Identify the starting phrase: Phrase (C) "the universe is an endless expanse of" sets up the subject ("the universe") and verb ("is"), followed by the preposition "of". This requires a noun phrase to follow it.
2. Connect (C) to the next logical part: Phrase (A) starts with "mystery and wonder", which completes the phrase "endless expanse of" beautifully ("an endless expanse of mystery and wonder"). So, (C) is followed by (A). This gives us the sequence C-A ("the universe is an endless expanse of mystery and wonder, with billions of").
3. Connect the remaining phrases: Phrase (A) ends with "with billions of", which requires a plural noun to follow. Phrase (D) begins with "galaxies and trillions of stars, each one", which fits perfectly after "billions of". This gives us the sequence C-A-D ("the universe is an endless expanse of mystery and wonder, with billions of galaxies and trillions of stars, each one").
4. Complete the sentence: Phrase (D) ends with "each one", which acts as a singular subject modifier and needs a noun phrase/description to follow. Phrase (B) "a burning beacon of light in the vastness of space" completes the description of "each one" (star/galaxy). This gives the final sequence C-A-D-B.

Rearranged Sentence:
"The universe is an endless expanse of mystery and wonder, with billions of galaxies and trillions of stars, each one a burning beacon of light in the vastness of space."

This sentence is grammatically correct and contextually coherent. Therefore, the correct option is CADB.