A boy found the answer for the question "Subtract the sum of $$\frac{1}{4}$$ and $$\frac{1}{5}$$  from unity and express the answer in decimals" as 0.45. The percentage of error in his answer was

A

$$\left(\frac{100}{11}\right)\%$$

B

50%

C

10%

D

$$\left(\frac{200}{11}\right)\%$$