Answer:
No, lo saqué de la biblioteca.
Explanation:
First of all, Ernesto is asking Matilde if she had bought the book he found interesting. A isn't right because lo comí means I ate it which doesn't sound fit at all. B means she read it, which has nothing to do with what he asked. C means I took it out/I borrowed it, and D means she basically enjoyed it. The correct answer to your question would be C, lo saqué.