If diploid zygotes are the result of a haploid sperm and egg combining, then what is a diploid zygote the result of?

Answer choices:
- photosynthesis
 - Plant reproduction
 - diploid sperm and egg
 - mate with females
 - Leptospirosis
 - haploid sperm and egg
 - triploid sperm and egg
 - two haploid eggs

 

      haploid sperm and egg    