Answer: Third Option is correct.
Step-by-step explanation:
Since we have given that
Length of front yard = 65 feet
Width of front yard = 45 feet
Perimeter of front yard is given by
[tex]2(Length+Width)\\\\=2(65+45)\\\\=220\ feet[/tex]
Length of back yard = 35 feet
Width of front yard = 45 feet
Perimeter of back yard is given by
[tex]2(Length+Breadth)\\\\=2(35+45)\\\\=160\ feet[/tex]
Total fencing she should buy is given by
[tex]220+160\\\\=380\ feet[/tex]
Hence, Third Option is correct.