Discussion
In a leftmost derivation, the nonterminal replaced at each step is
Answer: A
Correct answer: the leftmost nonterminal in the current sentential form
Fixing the order removes the freedom that makes derivations differ without meaning anything. A leftmost derivation always expands the leftmost nonterminal, a rightmost derivation the rightmost, and each corresponds one-to-one with a parse tree - which is why ambiguity is defined on trees rather than on derivations.
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