Population Calculation in the Town:

Given Information:
- For every 2 females, there is 1 male in the town.

Possible Population Options:
A. 31,000
B. 33,000
C. 35,000
D. 37,000

Population Calculation:
To calculate the possible population of the town, we can use the given ratio of females to males. Since the ratio is 2:1 (2 females for every 1 male), we can create the following equation to find the total population:
Total Population = 2 * Number of Females + Number of Males

Calculations for each Option:
A. For option A (31,000):
Total Population = 2 * 2 * 31,000 + 1 * 31,000
Total Population = 62,000 + 31,000
Total Population = 93,000
B. For option B (33,000):
Total Population = 2 * 2 * 33,000 + 1 * 33,000
Total Population = 66,000 + 33,000
Total Population = 99,000
C. For option C (35,000):
Total Population = 2 * 2 * 35,000 + 1 * 35,000
Total Population = 70,000 + 35,000
Total Population = 105,000
D. For option D (37,000):
Total Population = 2 * 2 * 37,000 + 1 * 37,000
Total Population = 74,000 + 37,000
Total Population = 111,000

Conclusion:
After calculating the total population for each option, we can see that the only possible population for the town based on the given ratio is 33,000 (Option B). This is because it satisfies the condition of having 2 females for every 1 male in the town.