To solve this problem, we need to identify which group of organisms exhibits double fertilization. Let's analyze each option:$\newline \bullet$Algae:$\newline$ - Algae do not exhibit double fertilization. They primarily reproduce through simple gametic fusion or asexual methods.$\newline \bullet$Fungi:$\newline$ - Fungi reproduce through spore formation and do not exhibit double fertilization.$\newline \bullet$Angiosperms:$\newline$ - Angiosperms, or flowering plants, are the only group that exhibits double fertilization.$\newline$ - In double fertilization, one sperm cell fuses with the egg cell to form a zygote, while the other sperm cell fuses with two polar nuclei to form the triploid endosperm.$\newline \bullet$Gymnosperms:$\newline$ - Gymnosperms do not exhibit double fertilization. They have a simpler fertilization process involving a single fertilization event.$\newline$Therefore, the correct answer is Option 3: Angiosperms.