First, let's simplify the fraction \( \frac{25}{225} \).
Both the numerator and the denominator can be divided by 25:
\[ \frac{25 \div 25}{225 \div 25} = \frac{1}{9} \]
Next, we need to analyze the decimal form of \( \frac{1}{9} \).
When we convert \( \frac{1}{9} \) to a decimal, it results in:
\[ 1 \div 9 = 0.1111\ldots \]
This decimal can also be represented as \( 0.\overline{1} \), which indicates that the digit "1" repeats indefinitely.
Now, let's evaluate the options:
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A. It is neither a terminating decimal nor a repeating decimal. (False)
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B. It is a terminating decimal. (False)
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C. It is both a terminating decimal and a repeating decimal. (False)
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D. It is a repeating decimal. (True)
Therefore, the correct answer is:
D. It is a repeating decimal.