In this error spotting question, identify the incorrect part in the sentence describing the most obvious feature of the modern world.

Introduction / Context:
This error spotting item tests your understanding of comparative and superlative adjectives in English. The sentence begins with The more obvious feature of the modern world is the enormous development of Science and Technology. However, there is no comparison being made between two or more features; instead, the sentence points to a single, outstanding feature. In such a case, we need the superlative form most instead of more. Recognising when to use comparative versus superlative forms is a key grammar skill.

Given Data / Assumptions:

• Part 1: The more obvious feature
• Part 2: of the modern world is the enormous
• Part 3: development of Science and Technology.
• Part 4: No error
• The sentence aims to highlight one main, outstanding feature of the modern world.

Concept / Approach:
In English, we use the comparative form more when comparing two things and the superlative form most when something is at the top level among three or more. For example, we say taller when comparing two people and tallest when talking about one person who is higher than everyone else. In this sentence, we are not ranking several features; instead, we are stating that this is the most obvious feature. Thus, the correct phrase should be The most obvious feature, making part 1 incorrect as written.

Step-by-Step Solution:
Step 1: Read the phrase The more obvious feature of the modern world in part 1. Step 2: Consider whether the sentence compares multiple features or identifies a single leading one. Step 3: Realise that the sentence selects one feature as the standout, so a superlative form is appropriate. Step 4: Replace more with most to form The most obvious feature of the modern world. Step 5: Conclude that the error lies in part 1 due to misuse of the comparative form.

Verification / Alternative check:
Rewrite the sentence using the correction: The most obvious feature of the modern world is the enormous development of Science and Technology. This version reads smoothly and matches standard usage found in books and articles. If the writer intended to compare two specific features, the sentence would have to mention both, for example, The more obvious feature between A and B. Since no such comparison is present, most is clearly required instead of more. Thus, part 1 is the segment with the error.

Why Other Options Are Wrong:
Part 2 correctly uses of the modern world is the enormous, maintaining agreement between feature and is and using the adjective enormous appropriately.

Part 3, development of Science and Technology, properly names the area being described and contains no grammatical mistakes.

Part 4 cannot be chosen because we have already identified an error in the form of the adjective in part 1.

Common Pitfalls:
Students sometimes overuse the comparative more when they see the article the before an adjective, without checking if a comparison is actually being made. To avoid this, always ask yourself whether you are talking about one thing in relation to many others (superlative) or directly comparing two things (comparative). Here, the modern world has many features, and we are picking the single most obvious one, so the superlative form most obvious is needed.

Final Answer:
The error is in part 1; the phrase should be The most obvious feature.