Final answer:
The Beastie Boys released "Licensed to Ill" in 1986, which was a significant success in their career. The album sold over 10 million copies, though the question inaccurately lists it as 5 million copies.
Step-by-step explanation:
The successful album released by the Beastie Boys in 1986 is "Licensed to Ill". This album was a critical and commercial success, marking a significant moment in the merging of genres like rock and hip-hop. It included hit singles such as 'Fight for Your Right' and 'No Sleep till Brooklyn.' As for sales, "Licensed to Ill" sold over 10 million copies, making it one of the best-selling rap albums of that era. However, the options provided in the question contain an inaccuracy regarding its sales figures. The correct choice, by the information given, would be (a) "Licensed to Ill" - 5 million copies, but this number is lower than the actual sales