To solve this problem, we need to calculate the length of the DNA based on the given distance between base pairs and the total number of base pairs.$\newline \bullet$The distance between two consecutive base pairs is given as $0.34$ nm.$\newline \bullet$The total number of base pairs in a typical mammalian cell is $6.6 \times 10^9$ bp.$\newline$To find the total length of the DNA, we multiply the number of base pairs by the distance between each pair:$\newline$Length of DNA$= 6.6 \times 10^9 \times 0.34$ nm$\newline$Convert the length from nanometers to meters:$\newline \bullet$1 nm$= 10^{-9}$ meters$\newline$Therefore, the length in meters is:$\newline$Length of DNA$= 6.6 \times 10^9 \times 0.34 \times 10^{-9}$ meters$\newline$Simplifying the expression:$\newline$Length of DNA$= 6.6 \times 0.34$ meters$\newline$Calculate the product:$\newline$Length of DNA$= 2.244$ meters$\newline$Rounding to one decimal place, the length of the DNA is approximately $2.2$ meters.$\newline$Therefore, the correct option is Option 2: 2.2 meters.