Which sentence has a critical tone? a. bicyclists who opt not to wear helmets are abandoning good sense and putting their lives at risk. b. bicycle helmets protect the delicate lobes of the brain, and their proper use is vital to safety. c. bicyclists must wear proper helmets for any ride, or they will face the dangers of head injury. d. bicycle helmet technology has improved greatly in the last decade, tailoring the fit to the rider’s age and size.

The answer is indeed A.Bicyclists who opt not to wear helmets are abandoning good sense and putting their lives at risk.

Explanation:

Sentences B, C, and D are objective in the sense that they express facts instead of the speaker's opinion. Helmets are important for safety, they have become more advanced and they protect the brain.

Sentence A, on the other hand, expresses an opinion. The speaker thinks it's lack of good sense not to wear a helmet while riding. Someone else might have a different point of view.

this question is grammatically incorrect and is illegible to me so i can not answer.