Identify the major product $(P)$ in the given reaction of propanal with dilute $NaOH$ followed by heating.
- A$CH_3-CH_2-CH=C(CH_3)-CHO$
- B$CH_3-CH_2-CH(OH)-CH_2-CH_2-CHO$
- C$(CH_3)_2CH-CH=CH-CHO$
- D$CH_3-CH_2-CH=C(CH_3)-CHO$
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