Answer:
E. The supply curve for helmets will shift to the right.
B. The demand curve for helmets will remain the same.
Step-by-step explanation:
In order to promote the use of helmets the subsidy will result in the shift of supply curve to the right because through subsidy producers are encouraged to supply more. Hence increasing the output.
Whereas the demand curve will remain the same. There will be no shift in demand curve. Only movements along the demand curve will be observed, the demand curve stays the same.
It is shown in the diagram in attachment.