A Researcher Asked Random Samples of 50 Kindergarten Teachers and 50

A researcher asked random samples of 50 kindergarten teachers and 50 12^th grade teachers how much money they spent out-of-pocket on school supplies in the previous school year, to see if teachers at one grade level spend more than the other. A 95% confidence interval for $\mu$ _K- $\mu$ ₁₂ is $30 to $50. Based on this result, it is reasonable to conclude that

A) 95% of all kindergarten and 12^th grade teachers spend between $30 and $50 on average.
B) 95% of all kindergarten teachers spend between $30 and $50 more then 95% of all 12th grade teachers.
C) kindergarten teachers spend more on average than do 12^th grade teachers.
D) 12^th grade teachers spend more on average than do kindergarten teachers.