For cyclists, the use of a helmet...

A)has no influence on the injuries they may suffer.
B)completely eliminates the probability of suffering head injuries.
C)considerably reduces the probability of suffering head injuries.Correct
Head injuries are the most serious in the event of a cyclist being struck. The use of a helmet reduces the probability of suffering this type of injury by up to three times.
Cyclists must wear a helmet when riding on interurban roads. In built-up areas, local municipal bylaws will regulate its mandatory use.
Those under 16 years of age must use one, both on urban and interurban roads.
Cyclists will be exempt from the obligation to wear a helmet when riding on prolonged uphill slopes, in conditions of extreme heat, or for medical reasons certified by a medical certificate.
Cyclists must wear a helmet when riding on interurban roads. In built-up areas, local municipal bylaws will regulate its mandatory use.
Those under 16 years of age must use one, both on urban and interurban roads.
Cyclists will be exempt from the obligation to wear a helmet when riding on prolonged uphill slopes, in conditions of extreme heat, or for medical reasons certified by a medical certificate.