Discussion
A marker nonterminal deriving epsilon is used in bottom up translation to
Answer: D
Correct answer: force a reduction at a chosen point so an action can run there
Because actions run only on reductions, an action needed part way through a production has nowhere to attach. A marker deriving epsilon supplies a reduction at exactly that point, which is both how mid-rule actions are implemented and how inherited attributes can be made available part way along a rule.
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