To solve this problem, we need to calculate the death rate in the population of Drosophila.$\newline$The death rate is defined as the number of individuals that die divided by the total population size, per unit time.$\newline$Given:$\newline \bullet$Number of Drosophila that died = 8$\newline \bullet$Total population of Drosophila = 80$\newline$The death rate per Drosophila per week is calculated as follows:$\newline$Death rate$= \frac{Number \ of \ deaths}{Total \ population} \newline$Death rate$= \frac{8}{80} \newline$Death rate$= 0.1 \newline$Therefore, the death rate in the population is 0.1 individuals per Drosophila per week.$\newline$This corresponds to Option 1.