I'm so lonely no friends

Larry is taking a walk in the park, the pollen in the air makes him sneeze consistently what line of defense is his immune system exhibiting

Answer the questions in the image for brainliest. are my answers right? ?

Active immunity refers to: a. the defenses people are born with. b. temporary immunity granted from another source. c. immunity gained through immunization and exposure to diseases. d. natural immunities that protect humans from other animal diseases