Jenny wants a total of 12 barbies dolls by the time she is 9 years old. Right now she has 4 barbie dolls. How many more does she need? Write an equation and solve.
A) x + 4 = 12; Jenny needs 8 more barbie dolls.
B) 4x = 12; Jenny needs 3 more barbie dolls.
C) x-4=12; Jenny needs 16 more barbie dolls.
D) x + 12 = 4; Jenny needs 8 more barbie dolls.