Problem: John was sitting at point C near a railway track. Suddenly, he heard a train coming towards him from point A with constant sound of its horn. Eventually, it reached very close to him at point B. Then the train sped by him at point C where he was sitting, reaching point D after some time. Finally, it reached even farther from him at point E. Would point E have lower or higher frequency than point D?

A: lower

Problem: Danny owned two parcels of land. parcel A had a soil with high salinity levels, while parcel B had a rich and healthy soil. Which parcel had a more biologically diverse soil?

A: parcel B

Problem: Year 2022 would be an interesting year when three comets would get scientists' attention - Comet A, Comet B, and Comet C. Comet A and C are very faint, but Comet B is very bright. Comet A would enter the inner solar system on February 10, 2022 and leave the inner solar system on February 20, 2022. Comet B would enter the inner solar system on February 18, 2022 and leave the inner solar system on February 26, 2022. Comet C would never enter the inner solar system. On Which date Comet B's dust would start reflecting sunlight?

A: February 18, 2022

Problem: Bill and Chad both displayed allergic reactions. Bill's were mild symptoms, while Chad's were more severe allergic reactions and was rushed to the hospital. Which person's allergies could be treated with epinephrine?

A:
Chad's