Correct option is C
Assertion (A): "Multiple testing instruments must be used for formative assessment" – This statement is correct. Formative assessment involves various tools and techniques (such as quizzes, assignments, observations, etc.) to continuously evaluate student progress and provide timely feedback. Using multiple instruments gives a more comprehensive understanding of the learner's development.
Reason (R): "Formative assessments are used for providing credits" – This statement is incorrect. Formative assessments are primarily used to monitor learning progress and offer feedback to improve learning. They are not typically used to award credits or final grades; summative assessments are used for that purpose.