‘I was teaching a grammar item, voice and tense the other day. I found this really good text full of lots of examples. I pointed out the examples and explained the use of passives.
It appeared the students had understood. However, when I gave them practice activity, very few could do it. ‘Suggestions for this teacher are provided below. Choose the one that does NOT fit.

Correct option is B

The suggestion that does NOT fit for the teacher who struggled with teaching grammar is "Work with students on their vocabulary." While vocabulary is important, the issue described by the teacher pertains to teaching grammar, specifically voice and tense, and how students apply these concepts in practice. The other suggestions (a, c, d) are more directly relevant to improving grammar teaching, focusing on motivation, appropriateness of the material, and clarity of explanation.