In 90.512, identify each digit's place:<br><br>
&bull; 9 &rarr; tens<br>
&bull; 0 &rarr; ones<br>
&bull; 5 (first decimal) &rarr; tenths<br>
&bull; 1 (second decimal) &rarr; hundredths<br>
&bull; 2 (third decimal) &rarr; thousandths<br><br>
The digit in the tenths place is 5.<br><br>
Final Answer: B: 5