Amanda simplifies the following expression and shows her work below. What mistake did Amanda make that resulted in an incorrect answer? 14−8÷2 + 3∙4

14−4 + 3∙4

14 – 7 ∙ 4

14−28

-14

a
She added before multiplying

b
She multiplied before dividing

c
She subtracted before adding

d
She added before dividing