Rearrange the following sentences to form a coherent paragraph: 1. This allows a programmer to specify the structure and behavior of an object-oriented program. 2. Object-Oriented Programming (OOP) is a programming paradigm based on the concept of "objects," which can contain data and code. 3. A central tenet of OOP is the concept of a "class," which acts as a blueprint for creating objects. 4. The key advantage of this approach is that it models real-world entities, making complex systems easier to manage and debug.

Correct — A. Sentence 2 spells the term out with its abbreviation, Object-Oriented Programming (OOP), and defines it — the mark of a first mention, so it opens.

Sentence 3 uses the short form OOP and introduces the class. This in sentence 1 points back to that class: the blueprint is what lets a programmer specify structure and behavior.

This approach in 4 sums up the paradigm, so it closes → 2, 3, 1, 4, option (a).

Why the others are wrong

• (b)
  4, 3, 2, 1 — Opens on this approach before any approach has been named, and pushes the definition of OOP to third place.
• (c)
  3, 1, 4, 2 — Opens with the short form OOP before sentence 2 has spelled it out, and ends on the definition that should introduce the topic.
• (d)
  1, 2, 3, 4 — Opens on This, with nothing before it to point to. The 'This' of sentence 1 needs the class of sentence 3 ahead of it.

This paragraph runs definition → central idea → what it allows → evaluation.

Two signals fix that order. A term spelled out with its abbreviation in brackets is being introduced, and later sentences use the short form. And This or this approach points back to something already named, so it cannot open.

Key facts

• A term spelled out with its abbreviation in brackets marks its first mention, and the short form follows.
• 'This approach' refers back to an approach already described, here OOP as a whole.
• In OOP, a class is a blueprint from which objects are created.

Common traps

• Opening with sentence 3 because it states a 'central tenet' — it uses OOP before sentence 2 spells it out.
• Putting the advantage sentence first because it sounds like a thesis — 'this approach' needs the approach named before it.

No directly related past PYQ was found.