Verifying annual CPI increases Steps:

• Compute year-over-year changes: 2009 (+2), 2010 (+2), 2011 (+1), 2012 (+3), 2013 (+3).
• Confirm all changes are positive, showing consistent rises.
• Rule out options by checking rates: 2011 rate ≈0.96%, 2013 rate ≈2.78%.
• Identify A as matching the pattern of yearly increases.

Why A is correct:

• CPI definition measures average price levels; consistent upward values from 100 to 111 confirm annual increases.

Why the others are wrong:

• B: Fastest absolute increase was +3 in 2012 and 2013, not +1 in 2011.
• C: 2013 inflation rate = (111-108)/108 × 100% ≈ 2.78%, not 5%.
• D: Smallest increase was +1 in 2011, not +3 in 2013.

Final answer: A