The correct option is C doubles
We know that
Perimeter of a rectangle, P=2(l+b)
where l and b are the length and breadth of the rectangle respectively.
Now, the length and breadth are doubled.
The new length and breadth of the rectangle is,
l′=2l; b′=2b
Perimeter of the new rectangle,
P′=2(l′+b′)
P′=2(2l+2b) =2×2(l+b) =2P
Therefore, the new perimeter is double the original one.