A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first line because it introduces the main topic of the text. It sets up the discussion about how traditional banks add value to customers. This follows the rule of Topic Sentence. Why other lines are not chosen? The other paragraphs are not chosen because they do not stand alone as the first sentence. For example, Paragraph 2 starts with "The bank's basic job..." which uses the definite article "the" and assumes prior knowledge. Paragraph 3 starts with "Further, as only a small portion..." which uses a transitional word "Further". Paragraph 4 starts with "The ability to retain deposits..." which also uses the definite article "the". Paragraph 5 starts with "The ability to deploy invested funds..." which again uses the definite article "the".

Concluding sentence: Why this is the last line? This paragraph is the last line because it wraps up the main ideas of the text. It summarizes the importance of deploying funds for the bank and the economy. This follows the Summary Style rule.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it explains a key point about how banks add value. It follows the Broader to Specific Strategy. The first paragraph introduces the topic, and the second paragraph gives a specific example of the bank's role.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it continues the discussion about the bank's survival. It uses the Logical Order strategy. The second paragraph talks about risk absorption, and the third paragraph explains how trust is important for the bank's survival.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it discusses the importance of retaining deposits. It follows the Cause and Effect Relationship strategy. The third paragraph explains the need for trust, and the fourth paragraph states that retaining deposits is also important for survival.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects with Paragraph 4 because it introduces another important aspect of banking. It uses the Broader to Specific Strategy. The fourth paragraph talks about retaining deposits, and the fifth paragraph explains how deploying funds is also crucial for the bank.