Final answer:
The conservation area's budget rounded to the nearest million is $13 million. Therefore, the correct answer is a.
Step-by-step explanation:
To find the conservation area's budget rounded to the nearest million, we need to round the given budget to the nearest million. The state-funded budget of the conservation area is $12.958 million per year. To round this amount to the nearest million, we look at the digit in the millions place, which is 12. We check the digit to the right of the millions place, which is 9. Since 9 is greater than or equal to 5, we round up the millions place to 13 million. Therefore, the conservation area's budget rounded to the nearest million is $13 million.