def matrix_multiply(A, B):
    ...
    return C

# Example matrices
A = [
    [1, 2, 3],
    [4, 5, 6]
]

B = [
    [7, 8],
    [9, 10],
    [11, 12]
]

print(matrix_multiply(A, B))
# Expected output:
# [
#     [58, 64],
#     [139, 154]
# ]

# Another example
C = [
    [2, 3],
    [0, 1],
    [4, 5]
]

D = [
    [1, 2, 3],
    [4, 5, 6]
]

print(matrix_multiply(C, D))
# Expected output:
# [
#     [14, 19, 24],
#     [4, 5, 6],
#     [24, 33, 42]
# ]