Answer:
Because Bali and Sugriva both looked alike.
Step-by-step explanation:
The given question concerns with the Hindu Myth 'The Ramayana.'
The myth is about Prince Rama who is exiled for fourteen years from his palace and lived in forest, where Sita, his wife was abducted by Ravana.
In Prince Rama's quest, Sugriva asked Rama to help him regain his kingdom from his brother Bali who forcefully took the kingdom from him and his wife, and in return he will help Rama in his quest. Prince Rama agreed to his proposal. But when Bali and Sugriva were fighting with each other, Rama couldn't shoot his bow and arrow because both the brothers looked alike. Rama was able to recongise Sugriva after Hanuman put a garland on the neck of Sugriva.
Thus the correct answer is that because both the brothers looked alike, Rama was not able to shoot his arrow and bow.