Discussion
Which advantage does that scheme give?
Answer: B
One wire, simple transceivers and no arbitration make it very cheap for undemanding devices. The last option states exactly those reasons, which makes it a correct and more explanatory version of the same answer. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Naming what changes and what stays the same is the reliable route through questions of this shape.
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