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A
Nothing changes
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B
The entire circuit stops working because the single path is broken
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C
Only that bulb dims
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D
The circuit gets brighter
Why this is the answer
In a SERIES CIRCUIT, if one component burns out, the ENTIRE circuit stops working because there's only ONE path for current — breaking it anywhere stops all flow (like old Christmas lights where one bad bulb killed the whole string). ASVAB Electronics Information tests circuit types. SERIES: components in a single path; same current through all; if one breaks, all stop. PARALLEL: multiple paths; if one branch breaks, others keep working (like household wiring). Knowing that a break anywhere in a series circuit stops everything (vs parallel) is commonly tested.
Source: ASVAB Electronics Information — Series Circuits