答案：A

解析：

Choice A is correct. The number of people aged 16 and older who were employed in the United States in 2004 can be found by calculating 66% of 223357000.

66% of 223357000 can be found as follows:

0.66*223357000=147415620

Hence 147415620 people aged 16 or older were employed in the United States in 2004.

Of this number, 46.4% were women. To calculate the number of women in this age group who were employed, find 46.4% of 147415620:

0.464*147415620=68400847.68

Therefore, approximately 68400000 women aged 16 and older were employed in the United States in 2004.