Discussion
A/b=c/d only if
Answer: B
Cross-multiplying the proportion clears both denominators:
\[ \frac{a}{b} = \frac{c}{d} \quad\Longrightarrow\quad ad = bc \]
Multiply both sides by \( bd \): the left gives \( ad \) and the right \( bc \). This holds provided \( b \) and \( d \) are non-zero.
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