Fill in the blank with the most appropriate word.
_________ you say to her, she still keeps smiling.
An adverb is a word or phrase that qualifies or changes an adjective, verb or another adverb, to express a relation of a situation, cause etc.
The correct answer is A)whatever as it indicates something being carried out no matter whatever happens.
Options B, C, and D are wrong as they indicate something regardless to which, any person who, and every time that happens respectively.
Whatever you say to her, she still keeps smiling.