Option 1 -> Starts with income increase, but doesn't establish the conditions first.
Option 2 -> Places the graphical shift before explaining the demand change.
Option 3 -> Correctly sequences: conditions (B) → trigger (A) → effect (D) → graphical representation (C).
Option 4 -> Incorrectly starts with the graphical shift rather than the causal sequence.
Hence, Option 3: (B), (A), (D), (C) -> This is the correct logical sequence for explaining change in demand for a normal good. First, we establish the ceteris paribus conditions - "given the prices of other goods and preferences" (B). Then, the trigger event occurs - "consumer's income increases" (A). This leads to the direct consequence - "demand for the normal good at given price changes" (D). Finally, we represent this graphically - "the demand curve shifts rightward" (C). For normal goods, an increase in income always increases demand, causing a rightward shift in the demand curve. -> correct