To convert 70% to a simplified fraction, you can start by writing 70% as:
\[ 70% = \frac{70}{100} \]
Next, simplify \( \frac{70}{100} \) by dividing both the numerator and denominator by their greatest common divisor, which is 10:
\[ \frac{70 \div 10}{100 \div 10} = \frac{7}{10} \]
So, the simplified fraction for 70% is \( \frac{7}{10} \).
The correct answer is A) \( \frac{7}{10} \).