solid iron would mostly likely be in solid form.
Answer: Option (b) is the correct answer. ;
The correct answer is option B, solid iron, as it has a fixed shape due to tightly packed molecules held together by strong intermolecular forces. In contrast, helium gas, liquid octane, and hydrogen plasma do not have a fixed shape. This key property of solids is due to the close arrangement of particles that do not move freely.
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