How can a decimal be converted to a percentage?
a. multiply by 10
b. multiply by 100
c. divide the numerator by the denominator
d. find the lowest common factor

Simple...

let's say you have-->>

0.50 to convert this into a percentage you move the decimal 2 places over to the right-->>

50%

Let's say 0.2->>>

Move it over twice..

20%

As we can easily tell you multiply the decimal by 100

Thus, your answer, B.