Option B
5 hundredths is not the way to express 0.50
Solution:
Given that Three of the choices are ways to express 0.50
To find: wrong option
Let us first write 0.50 in different ways
To convert a Decimal to a Fraction follow these steps:
Step 1: Write down the decimal divided by 1, like this: decimal 1.
Step 2: Multiply both top and bottom by 10 for every number after the decimal point. ...
Step 3: Simplify (or reduce) the fraction.

means 50 hundredths
Therefore option D is correct
On simplifying
we can write,

means one half
Therefore option A (one half) is correct
Similarly, \frac{5}{10} means 5 tenths
Therefore Option C is also correct
Thus the wrong option is B
Justification:
5 hundredths can be written as:

Therefore option B is wrong