Step 1: Understand Article 14’s twin phrases.
India’s Article 14 uses (i) “equality before the law” (from Britain) and (ii) “equal protection of the laws” (from the U.S. 14th Amendment).
Step 2: Identify the requested source.
The question asks specifically for “equal protection of law(s)”—this is drawn from the United States.
Step 3: Conclude.
\[
\boxed{\text{United States of America (Option A).}}
\]