Rearrange the following sentences to form a meaningful passage: 1. International space law governs satellite placement and liability.2. Treaties emerged during the Cold War to prevent militarization.3. New challenges include space debris and commercial mining.4. Regulation needs adaptation to current realities.

Correct — A. Read the four as a timeline: origin, present rule, new problem, remedy.

Emerged (2) is the only past-tense verb: the Cold War treaties come first, so 2 opens.
Governs (1) gives the law as it stands today.
New challenges (3) are new against what that law covers: debris and mining, not placement and liability.
Needs adaptation (4) is the remedy, so it closes.

2-1-3-4 → option (a).

Why the others are wrong

• (b)
  1-3-4-2 — 1-3-4-2 puts the Cold War history after the closing remedy. Once 4 says regulation needs adaptation, the passage has concluded, and a step back to its origin has nowhere to attach.
• (c)
  1-2-3-4 — 1-2-3-4 opens on today's rule and then steps back to the Cold War, so time runs present → past → new. It also parts 'New challenges' (3) from the law (1) whose scope makes them new.
• (d)
  3-2-1-4 — 3-2-1-4 opens on 'New challenges', but new is a comparison: nothing before it says what the challenges are newer than. An opening sentence needs a topic, not a contrast with something unstated.

Sentence-ordering items reward links between sentences: a pronoun and its noun, a word like new or also that points back, a tense that fixes time.

These four sentences carry no pronouns, so the signals are time and tense: emerged during the Cold War, governs, new, needs adaptation. Order them by when each is true.

Key facts

• Sentence 2 is the only one in the past tense: 'Treaties emerged during the Cold War'.
• 'New challenges' needs something earlier to be new against, so sentence 3 cannot open.
• 'Needs adaptation' in sentence 4 answers the challenges in sentence 3, so 3 comes right before 4.

Common traps

• Treating sentence 1 as the automatic opener because it names the topic, when the key starts from the Cold War origin.
• Opening with 'New challenges' without asking what they are new against.

No directly related past PYQ was found.