Step 1: Cost-push inflation happens when input costs rise, forcing higher prices.
Step 2: Wage-push and profit-push are the two standard categories, so (A) is correct.
Step 3: Wages rising faster than productivity raises cost per unit, this is exactly wage-push inflation, so (R) is correct.
Step 4: (R) explains the mechanism behind one part of (A).
\[ \boxed{\text{Option (1): Both correct, (R) explains (A)}} \]