ANSWER
Option B
Step-by-step explanation
To determine the lewis structure that is not valid, we will need to apply the octet rule
The octet rule helps us to understand the tendency of atoms to prefer to have eight electrons in the valence shell.
Looking at the given options, option B breaks the octet rule due to the following reasons
Oxygen has three bonds, that is 2 bonds to carbon and 1 bond to hydrogen. This results in a total of 6 electrons attached to the bonds. Also, there are two lone pairs of electrons in the structure resulting in a total number of 8 electrons in the structure.
Generally, oxygen can only have two bonds but the structure is showing three bonds which means it has accommodated more than what it can take
Hence, the correct option is B