I have 2 select options. I want to change the drop down options in second select options based on what I select in first select options. How do I do that in jquery?

<select id="Manage">
   <option value="a">A</option>
   <option value="b">B</option>
   <option value="c">C</option>
<select>

Second select option if A is selected from first select option

<select id='selectA'>
   <option value="1">1</option>
   <option value="2">2</option>
</select>

Now if B is selected from first select option

<select id='selectA'>
   <option value="3">3</option>
   <option value="4">4</option> 
</select>