List the factors of both numbers and find the common one.<br><br>
&bull; Factors of 8: 1, 2, 4, 8<br>
&bull; Factors of 10: 1, 2, 5, 10<br>
&bull; Common factors: 1 and 2<br>
&bull; From the options, 2 is the answer.<br><br>
Final Answer: 2