Discussion
Assertion (A): LR grammars are usually written with left recursion for list constructs.
Reason (R): A right recursive list forces the entire list onto the stack before the first reduction can take place.
Answer: A
Both are true and the reason gives the mechanism, and the difference is measurable on long lists. Left recursion reduces after each element and keeps the stack at constant depth, which matters for generated initialiser lists and similar input.
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