Multiply 429 by 9, then round the result to the nearest thousand.<br><br>
&bull; 429 &times; 9 = 3861<br>
&bull; The hundreds digit is 8 (&ge; 5), so round up.<br>
&bull; 3861 &asymp; 4000 (to the nearest thousand)<br><br>
Final Answer: A: 4000