To calculate Miss Tonasket's earnings for selling 12 televisions, we can use the salary equation provided:
\[ \text{Earnings} = 2500 + 100t \]
where \( t \) is the number of televisions sold.
Now, substituting \( t = 12 \):
\[ \text{Earnings} = 2500 + 100 \times 12 \]
Calculating the second term:
\[ 100 \times 12 = 1200 \]
Now, substituting that back into the equation:
\[ \text{Earnings} = 2500 + 1200 = 3700 \]
Therefore, if Miss Tonasket sells 12 televisions, she will earn $3,700.
The correct answer is: B) 3700.