Concept:These words are degree adverbs, and the correct choice depends on the grammatical pattern surrounding the blank.
Explanation:The original sentence is not visible in the question prompt.
Among the options, "too" is the word that fits the common WAEC test structure: "too + adjective/adverb + to + verb".
For example: "too tired to walk", "too late to go".
"Rather", "much", and "more" do not naturally complete this specific pattern.
Therefore, for the usual WAEC fill-in-the-blank pattern, the best completing word is "too".
Answer:A. too