Answer : incorrect
Explanation : The stressed vowel is the weak vowel (í), between two strong vowels (e) and (a). Then hiatus is produced, that is, separation of the vowels in different syllables. Le-í-a. For this reason the written accent is necessary and that sentence above was incorrect because "leia" it was written without a written accent.
Correct sentence should be : El niño leía el libro.
[tex]\textit{\textbf{Spymore}}[/tex]