Correct option is C
Peter Drucker, a prominent figure in modern management theory, identified several practices or attitudes that could hinder an organization's or individual's performance. Among the options listed:
(A) Dogmatism (rigidity in thinking or approach),
(B) Having lofty objectives (unrealistic goals that are too ambitious or vague),
(C) Attempting to do several things (lack of focus or spreading resources too thin)
are indeed considered 'sins' in Drucker's philosophy that lead to non-performance because they can detract from effective decision-making, strategic focus, and operational efficiency.
Option (D) "Less number of employees" is not specifically cited by Drucker as a sin contributing to non-performance. Drucker’s emphasis was more on productivity, efficiency, and effectiveness in management practices rather than on the specific number of employees.
Therefore, the most appropriate answer is (c) A, B, and C only.