Which of the following resonating structures of 1-methoxy-1, 3-butadiene is least stable [IIT Screening 2005]

• A. \[\overset{}{\mathop{C}}\,{{H}_{2}}-CH=CH-CH=\overset{\oplus }{\mathop{O}}\,-C{{H}_{3}}\]
• B. \[C{{H}_{2}}=C{{H}_{2}}-\overset{}{\mathop{C}}\,H-CH=\overset{\oplus }{\mathop{O}}\,-C{{H}_{3}}\]
• C. \[\overset{}{\mathop{C}}\,{{H}_{2}}-\overset{\oplus }{\mathop{C}}\,H-CH=CH-O-C{{H}_{3}}\]
• D. \[C{{H}_{2}}=CH-\overset{}{\mathop{C}}\,H-\overset{\oplus }{\mathop{C}}\,H-O-C{{H}_{3}}\]