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Question:

Read the following sentences and choose the option that best arranges them in a logical order.

Choose the best option:

The mechanism of electroweak symmetry breaking is one of the most important issues in the present Particle Physics.
They are required to give masses for all quarks and leptons and to guarantee the absence of the gauge anomaly.
In the standard electroweak model a fundamental Higgs doublet is introduced to cause the spontaneous symmetry breaking.
Supersymmetry (SUSY), eliminating all quadratic divergences, may provide a better theoretical basis to describe a fundamental Higgs boson with a relatively small mass to a high energy cutoff scale, say the Planck scale for example.
In the minimal SUSY extension of the standards electroweak model the Higgs sector consists of two chiral superfields of Higgs doublets (H1 and H2 with opposite hypercharges).

Explanation:

The paragraph is on the concept of electroweak symmetry and the role of the Higgs doublet in it. Statement 1 makes for a suitable introduction since it introduces the concept of “electroweak symmetry” in the context of Particle Physics. This eliminates options 3 and 5.
Statement 1 is followed by statement 3 which tells us why a Higgs doublet is introduced with regard to the electroweak model mentioned in statement 1. Eliminate options 2 and 4.
Statement 4 follows statement 3 by introducing the concept of Supersymmetry(SUSY) which is referred to in its abbreviated form in the rest of the sentences.
Statement 5 follows statement 4 by linking SUSY with the electroweak model and introducing the concept of two chiral superfields.
The relative pronoun “they” in statement 2 refers to the same chiral superfields, lending an apt conclusion to the paragraph.
Thus, the correct sequence is 1, 3, 4, 5, 2.
Hence, the correct answer is option 1.

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