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## Step 1<br />The problem is asking us to identify the relationship between the terms "opposite" and "along a scale". The options provided are "antonyms", "complementary", "gradable", and "relational".<br /><br />## Step 2<br />Let's analyze each option:<br />- "Antonyms" are words that have opposite meanings. This doesn't apply to the terms "opposite" and "along a scale".<br />- "Complementary" refers to things that complete each other. This doesn't apply to the terms "opposite" and "along a scale".<br />- "Gradable" refers to things that can be graded or ranked. This doesn't apply to the terms "opposite" and "along a scale".<br />- "Relational" refers to things that are related to each other. This applies to the terms "opposite" and "along a scale", as they are related in the context of a scale.<br /><br />## Step 3<br />Based on the analysis, the correct answer is "relational".