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Let's evaluate the sums in both columns:
**Column A:**
\[ 0.7 + 1.8 \]
Performing the addition:
\[ 0.7 + 1.8 = 2.5 \]
**Column B:**
\[ 1 + 0.25 \]
Performing the addition:
\[ 1 + 0.25 = 1.25 \]
Now let's summarize the results:
- **Column A:** The sum is \( 2.5 \), which is a rational number.
- **Column B:** The sum is \( 1.25 \), which is also a rational number.
Now we can evaluate the statements:
1. **Only column A has a rational sum** - This statement is false since column B also has a rational sum.
2. **Only column B has an irrational sum** - This statement is false since both sums are rational.
3. **Both column A and B have rational sums** - This statement is true.
Thus, the correct statement is: **Both column A and B have rational sums.**