Vitamin B12 is the distractor in this question because it also causes a broad-based, ataxic gait and decrease in vibration. But - Vitamin B12 will not have symptoms like Hemolytic Anemia (decreased hemoglobin, increased LDH). Vitamin E = answer, see below for explanation.
WTF is "weakness of plantar dorsiflexion" ????? it's like saying "extension flexion"
This is not the only obvious technical mistake in the new NBMEs ...
Vitamin E deficiency causes hemolytic anemia, acanthocytosis, muscle weakness, posterior column and spinocerebellar tract demyelination.
just for addition - here MCV is normal, in B12 deficiency it is high