The correct answer is A: I only.
Here's the reasoning:
I. The decimal represents - This is true for any rational number when it's converted to decimal form because a rational number can always be expressed as a decimal.
II. The decimal terminates - This is not always true. A rational number will have a terminating decimal if, when expressed in simplest form, its denominator has no prime factors other than 2 or 5. If it has other prime factors, the decimal will be repeating.
Since statement I is always true and statement II is not, the correct answer is A: I only.