The question asks us to rearrange five given sentences (A, B, C, D, E) into a meaningful paragraph and identify the fourth sentence in the correct order.

Step-by-Step Sentence Rearrangement

Let's analyze the sentences to find the logical flow:

• Sentence A: "When I was preparing for my final exams, I decided to study only one subject at a time." - This sentence introduces a personal situation and a specific study method. It is a good starting point.
• Sentence E: "And I only moved on to the next when I fully grasped the material." - This sentence directly elaborates on the method mentioned in sentence A, explaining *how* the speaker studied one subject at a time. Therefore, E should follow A.
• Sentence D: "Most of my peers studied multiple subjects a day." - This sentence presents a contrast between the speaker's method (explained in A and E) and the methods used by others. It logically follows the description of the speaker's approach.
• Sentence B: "I noticed that I could learn something way faster if I immersed myself in it for a few days." - This sentence describes a positive outcome or a realization derived from the speaker's focused study method. It explains the benefit of the approach described in A and E. Placing it after the contrast (D) highlights the effectiveness of the speaker's strategy compared to peers.
• Sentence C: "Real success happens when we focus on one thing at a time." - This sentence provides a general conclusion or principle, summarizing the lesson learned from the personal experience described in the previous sentences. It naturally fits as the concluding statement.

Identifying the Fourth Sentence

Based on the logical flow identified above, the most coherent order is:

1. A. When I was preparing for my final exams, I decided to study only one subject at a time.
2. E. And I only moved on to the next when I fully grasped the material.
3. D. Most of my peers studied multiple subjects a day.
4. B. I noticed that I could learn something way faster if I immersed myself in it for a few days.
5. C. Real success happens when we focus on one thing at a time.

In this sequence, the fourth sentence is B. This order establishes the context, explains the method, contrasts it with others, highlights the benefit discovered (learning faster through immersion), and concludes with a general principle about the power of focus.