I would go with B, or Ways to build immunity to diseases. Why? Well, just by using the word biology, we can use process of elimination. The prefix “bio” means life, so C and D already would be out. The suffix “ology” means the study of, so the word biology means the study of life. Because biology often has to do with diseases and finding cures to sustain human life spans, the only logical answer would be B. A would make no sense in terms of biology.
        
             
        
        
        
Answer:
Explanation:
the pronoun "he" tells you this sentence is written in third person as it isn't referring to the person speaking but someone else
 
        
             
        
        
        
(A).me is the answer of this question.Because I got full meaning by keeping this option.