In the following question, four words are given in bold and numbered (1), (2), (3), and (4). These words may not be in their correct positions. Choose the option that provides the correct pair(s) of words that should replace each other to make the sentence grammatically correct and contextually meaningful.

Mourners assembled at the memorial ancestors (1) to place garlands and departed (2) to honor the memory of their shrine (3) as a tribute of respect towards the offerings (4) souls.

The correct option is 1-3 and 2-4.

Step-by-Step Analysis:
Consider the given sentence:
"Mourners assembled at the memorial ancestors (1) to place garlands and departed (2) to honor the memory of their shrine (3) as a tribute of respect towards the offerings (4) souls."

Let's evaluate the pair replacements required to make the sentence contextually and grammatically coherent:

1. Interchange (1) ancestors and (3) shrine:
• A "memorial shrine" correctly specifies the physical place where mourners assemble.
• "Ancestors" correctly fits the phrase "honor the memory of their ancestors", which means paying respect to deceased forefathers.

2. Interchange (2) departed and (4) offerings:
• "Garlands and offerings" forms a natural compound phrase referring to items brought to pay respect.
• "Departed souls" is the appropriate phrase describing those who have passed away.

Corrected Sentence:
"Mourners assembled at the memorial shrine to place garlands and offerings to honor the memory of their ancestors as a tribute of respect towards the departed souls."

Therefore, the correct pair of replacements is 1-3 and 2-4.