The Bible does not explicitly state what type of fruit Eve ate.
While popular culture often depicts it as an apple, the Book of Genesis simply refers to it as the "fruit of the tree of the knowledge of good and evil" without specifying its species. According to the reference, "Although the idea that Adam and Eve ate an apple is common today, the Book of Genesis never mentions the identity of the forbidden fruit."
Therefore, the answer is not specified in the Biblical text.
