Consider the following sentences:
[A] Without adequate shielding, this radiation damages sensitive electronic components and degrades satellite life spans.
[B] The Earth's magnetosphere deflects the vast majority of high-energy charged particles streaming from the solar wind.
[C] However, intense geomagnetic storms can breach these protective fields, funneling ions into low Earth orbit.
[D] Aerospace engineers must therefore harden spacecraft hardware using fault-tolerant circuits and physical absorbents.

What is the most coherent sequence?

Answer and explanation

Correct answer: C. B -> C -> A -> D

  1. Step 1: Identify the baseline natural phenomenon introduced independently. Sentence [B] describes the general protective role of Earth's magnetosphere against the solar wind.
  2. Step 2: Sentence [C] introduces the critical exception with the contrast marker "However" ("geomagnetic storms can breach these protective fields"). Sentence [A] specifies the vulnerability caused by this orbital ion penetration ("Without adequate shielding, this radiation damages..."), and Sentence [D] concludes with the engineering countermeasure ("Aerospace engineers must therefore harden..."). This establishes the sequence: B -> C -> A -> D.
Answer
B -> C -> A -> D.

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