As the coditional and the simple future both seem to be able to serve the same purpose of objection or disbelief. would "estudiará" also be correct? I know the question was asked in the context of a specific lesson but taken out of context such as in my notebook where I had both the use of simple future and conditinal lessons, without a hint, it can be difficult to choose.
The conditional is needed here because it is referring to a past event. The simple future is used to indicate disbelief about the present or future.
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