Which of the following is the most powerful type of LR parser?

Canonical LR(1) is the most powerful type of LR parser. It maintains the full, distinct lookahead information for every state, allowing it to parse the widest range of deterministic context-free grammars. While other parsers like LALR(1) and SLR(1) merge states together to save memory, Canonical LR(1) keeps them separate, preventing shift-reduce or reduce-reduce conflicts that simpler parsers cannot resolve.