How Well Do You Think You Know Uchiha Izuna?

Explanation
The correct answer is Senju. This answer is based on the information given in the question, which states that Izuna's three brothers died at the hands of someone. Among the given options, Senju is the only one that could potentially be responsible for their deaths. However, without further context or information, it is difficult to determine the exact reason or circumstances surrounding their deaths.

Explanation
Izuna was one of the five sons born to Tajima Uchiha. This suggests that Tajima Uchiha was the father of Izuna and his siblings. The question implies that this was before the era of ninja villages, indicating that the Uchiha clan, to which Izuna belonged, existed before the establishment of ninja villages.

Explanation
Izuna was considered one of the most gifted members of the Uchiha clan.

Explanation
Izuna once accompanied his father on a mission to kill Hashirama Senju.

Explanation
Izunna was shocked when Madara awakened his Sharingan.

Explanation
Sharingan is a special eye technique possessed by members of the Uchiha clan in the Naruto series. It grants the user various abilities, such as the ability to see chakra, copy other ninjutsu, and predict an opponent's movements. The Mangekyo Sharingan is an advanced form of the Sharingan that only a few Uchiha members can awaken. It grants even more powerful abilities, such as the ability to use Susanoo, a giant protective warrior. Therefore, the correct answer is Mangekyo Sharingan, as it is the advanced form of the basic Sharingan.

Explanation
Madara's return to the battlefield suggests that he had been injured previously. The question specifically mentions that Madara revealed the injury inflicted on someone. Among the given options, Izuna is the most likely candidate for the injured person. Izuna is Madara's younger brother and they were known to have fought against each other in the past. Therefore, it can be inferred that Madara revealed the injury inflicted on Izuna when he returned to the battlefield.

Explanation
During a battle with Tobirama, Izuna was mortally wounded by Tobirama's technique. This suggests that Tobirama used a powerful and effective technique that inflicted severe damage on Izuna, ultimately leading to his death. The specific details of the technique are not provided, but it can be inferred that it was strong enough to cause fatal injuries to Izuna.

Explanation
Izuna showed proficient skills in Fire Release.