Questions: Because of limited resources, the Office of Management and Budget reviews of regulations before they go into effect each year. fewer than a thousand out of tens of thousands fewer than a hundred out of thousands about ten thousand out of hundreds of thousands several hundred out of thousands

The answer is: several hundred out of thousands.

Explanation for each option:

1. Fewer than a thousand out of tens of thousands: This option suggests a very small proportion of regulations are reviewed, but the scale of "tens of thousands" is not typically accurate for the number of regulations reviewed by the Office of Management and Budget (OMB).

2. Fewer than a hundred out of thousands: This option implies an even smaller number of reviews, which is unlikely given the OMB's role in reviewing significant regulations.

3. About ten thousand out of hundreds of thousands: This option suggests a very large number of regulations are reviewed, which is not consistent with the OMB's capacity and the typical number of significant regulations.

4. Several hundred out of thousands: This is the most accurate option, as the OMB reviews several hundred significant regulations each year out of the thousands that are proposed. This aligns with the OMB's focus on reviewing economically significant regulations and those that have a substantial impact on public policy.