Stephanie is 12 years old and often assists neighbors on weekends by babysitting their children. Calculate the 2023 standard deduction Stephanie will claim under the following independent circumstances (assume that Stephanie's parents will claim her as a dependent).

a. Stephanie reported $1,055 of earnings from her babysitting.

b. Stephanie reported $2,445 of earnings from her babysitting.

c. Stephanie reported $19,300 of earnings from her babysitting.