The correct words for this sentence are 'Tengo miedo de que os caigáis de la bicicleta y no llevéis puesto el casco' (Option B).
The Spanish word 'miedo' means 'fear' in the English language (in this case, I am afraid).
The translation for this sentence is 'I am afraid that you will fall off the bike and you are not wearing a helmet'.
In conclusion, the correct words for this sentence are 'Tengo miedo de que os caigáis de la bicicleta y no llevéis puesto el casco' (Option B).
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