Which of the following suffices to convert an arbitrary CFG to an LL(1)…

Answer: None of the above.

Why: LL(1) has specific conditions that must hold for every nonterminal.

• For any nonterminal, the FIRST sets of its different productions must be pairwise disjoint (no FIRST/FIRST conflicts).

• If a production can derive ε, then its FIRST set must be disjoint from the FOLLOW set of that nonterminal (no FIRST/FOLLOW conflicts).

Why the listed transformations are insufficient:

• Removing left recursion helps for top-down parsing but does not resolve FIRST/FIRST or FIRST/FOLLOW conflicts that prevent LL(1).

• Left-factoring (factoring) can eliminate common prefixes and reduce conflicts but may still leave FIRST/FOLLOW overlaps or be impossible without changing the language.

• Some grammars are inherently ambiguous or require more than one token of lookahead; such grammars cannot be converted to LL(1) by standard local transformations.

Practical approach to attempt LL(1) conversion:

1. Remove left recursion where possible.

2. Left-factor productions to remove common prefixes.

3. Compute FIRST and FOLLOW sets and check for conflicts. If conflicts remain, consider grammar redesign or using a more powerful parser.

Conclusion: No single one of the transformations listed guarantees conversion of an arbitrary CFG to LL(1); therefore the correct choice is that none of the listed options alone suffices.