Respuesta :
"d. To ensure that Macduff is trustworthy and loyal to him" would be the best option from the list, since Malcolm's main concern in this tale is to make sure that his support group remains intact.
Answer;
-To ensure that Macduff is trustworthy and loyal to him
Explanation;
-Malcolm tries to make Macduff believe that he is an evil man to ensure that Macduff is trustworthy and loyal to him. Malcolm lies about himself to Macduff to test Macduff's trustworthiness and loyalty to him.