Consider this variation of B. It allows you the flexibility to use a QuestionGroup in multiple Surveys without having to re-enter the questions for each Survey.

TableKeys

Survey

PK = SurveyID

QuestionGroup

PK = QuestionGroupID

SurveyQuestionGroup

PK = SurveyQuestionGroup,

FK = SurveyID to Survey,

FK = QuestionGroupID to QuestionGroup,

AK = SurveyID,QuestionGroupID

Question

PK = QuestionID,

FK = QuestionGroupID to QuestionGroup,

AK = QuestionID,QuestionGroupID

Answer

PK = AnswerID, FK = QuestionID,

FK = QuestionID,QuestionGroupID to Question,

FK = SurveyID,QuestionGroupID to SurveyQuestionGroup