The correct answer is: a) Bharata tribe and a confederation of tribes.
The Battle of the Ten Kings was a battle fought in the 15th century BCE between the Bharata tribe and a confederation of tribes. The battle is described in the Rig Veda, the oldest Hindu scripture. The Rig Veda is a collection of hymns that were composed over a period of several centuries. The hymns are divided into ten books, or mandalas. The book that contains the hymns about the Battle of the Ten Kings is the seventh book.
The battle was fought over the control of the Kurukshetra region. The Kurukshetra region is located in the northern part of India. The battle was a long and bloody battle. The Bharata tribe was victorious in the battle. The battle is considered to be one of the most important battles in Hindu history.
The other options are incorrect. Option b) is incorrect because the Puru tribe and the Kuru tribe were two different tribes. Option c) is incorrect because the Bharatas and the Persians were two different peoples. Option d) is incorrect because the Pauravas and the Macedonians were two different peoples.