Without replacement:
$\frac{7}{10}*\frac{6}{9}=\frac{42}{90}$
With replacement:
$\frac{7}{10}*\frac{7}{10}=\frac{49}{100}$
After reading the question, one first assumes that the answer must be the one without replacement. But there was no option of 46.66% when it was asked in 2003. So from the options we conclude that it was asked with replacement of screws in mind.