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four expressions are shown below: I will mark brainliest

A. 21x + 6
B. 3(7x + 2)
C. 18x + 9
D. 3(6x + 3)

which of the two expressions are equivalent to 3(6x + 2 + x)?

1. A and D

2. C and D

3. A and B

4. B and C