Statements A, C, D and F describe key features of a good research problem. Statement A is true because a problem must be researchable given methods and resources. Statement C is correct since significance for theory or practice justifies the effort, and statement D is right that clear delimitation in terms of variables and context is necessary. Statement F is also true because many problems emerge from field experience or theoretical gaps, whereas B is false since the solution should not be known in advance and E is false because problems should be clearly, not vaguely, stated.
Option A:
Option A includes A, C and D, which are correct, but leaves out F. Since F correctly notes that research problems may arise from practice or theory gaps, omitting it makes the combination incomplete. A correct option must contain all the true statements identified in the list.
Option B:
Option B focuses on C, D and F and leaves out A. While C, D and F are true, A is also correct because feasibility in terms of methods and resources is an essential criterion. By excluding A, this option offers only a partial description of a good research problem.
Option C:
Option C correctly combines A, C, D and F and excludes the false statements B and E. It captures feasibility, significance, clear delimitation and genuine origin of problems, which together reflect sound research practice. Because it contains all and only the true statements, this is the correct answer.
Option D:
Option D brings in E alongside the otherwise correct statements. However, E is false because vagueness in problem statement leads to conceptual confusion and weak design. Including an incorrect statement makes this combination unacceptable.
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