Answer:
There is strong cultural influence from Africa in northeast region because Option C: African slaves were brought in the area to work on sugar cane plantations.
Step-by-step explanation:
There were different types of slaves such as field workers and house slaves. Slaves which were field workers were brought in the northeast region of America for sugar plantations. They were brought here by Portuguese. Portuguese noticed that the land was quite fertile and climate was suitable for growing crops. Slaves worked for plantation of sugarcane fields and even for the maintenance of this area.
Sugar economy grew in Brazil only because of these slaves. So, the most apt reason is Option C.