A Six Sigma program is designed to

The correct answer is D. improve processes to minimize defects and variation . The CSSBB material contrasts Lean and Six Sigma by stating that the primary Six Sigma improvement focus is to reduce variation . It further notes that when organizational challenges involve quality issues , excessive variation , and complex root-cause problems, Six Sigma tools should be used to minimize variation , apply rigorous problem solving, and focus on quality issues.

That is the essence of a Six Sigma program: improving process performance by reducing variation and therefore reducing defects, errors, and inconsistency. Option C relates more specifically to DFSS , which is about designing new products and processes. Option A is only one possible organizational activity, not the main purpose of Six Sigma. Option B is not a recognized core purpose in the CSSBB body of knowledge. Because Six Sigma is fundamentally a data-driven approach to improving process quality and consistency, the best verified answer is D. improve processes to minimize defects and variation .