To solve this problem, we need to identify which organism exhibits the XO type of sex determination. Let's analyze each option:$\newline \bullet$Option 1: Drosophila$\newline$ - Drosophila, commonly known as fruit flies, exhibit the XY type of sex determination, similar to humans.$\newline$ - Therefore, this option is incorrect.$\newline \bullet$Option 2: Birds$\newline$ - Birds have a ZW type of sex determination system, where males are ZZ and females are ZW.$\newline$ - Therefore, this option is incorrect.$\newline \bullet$Option 3: Grasshoppers$\newline$ - Grasshoppers exhibit the XO type of sex determination. In this system, males have one X chromosome (XO), and females have two X chromosomes (XX).$\newline$ - Therefore, this option is correct.$\newline \bullet$Option 4: Monkeys$\newline$ - Monkeys, like humans, have the XY type of sex determination.$\newline$ - Therefore, this option is incorrect.$\newline$Based on the analysis, the correct answer is Option 3: Grasshoppers.