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Suppose in the loop equation one traverses the source from its negative terminal to its positive terminal. This contribution is treated as 
Aa voltage drop
Bzero contribution
Ca voltage rise
Da current source term
Answer & Solution
Correct answer: C. a voltage rise
Moving across a source from negative to positive terminal means the electric potential increases, so it is a voltage rise. In KVL sign conventions, rises and drops are included with opposite signs.