Which of the following is a requirement for a valid will in Ohio?

A valid will in Ohio requires that it is in writing, signed by the testator, and witnessed by two individuals. This is crucial because the law aims to ensure that the testator’s intentions are clear and that there is evidence of their consent and understanding. The requirement for two witnesses helps to prevent fraud and ensures that there is credible testimony available regarding the testator's state of mind and the authenticity of the signature.

The option regarding notarization, while it can add a layer of authenticity, is not a fundamental requirement for a will to be considered valid under Ohio law. Additionally, the filing of a will with the probate court must occur after the testator’s death, not before execution; therefore, this option does not align with the legal process. Finally, the requirement of reading the will aloud before witnesses is also not stipulated as necessary for validity in Ohio. Consequently, the correct answer highlights the essential elements that constitute a legally binding will in the state.