Answer:
Option B. Logan thought he could finish the report in a weekend, but he had bitten off more than he could chew.
Step-by-step explanation:
An idiom is a phrase or an expression that has a figurative, or sometimes literal, meaning.
In the case of this example, the expression to discuss has a figurative meaning. To "bite off more than one can chew" is similar to say "to take more than one can carry", and this is the case of Logan, as he had taken on a task he was not able to finish due to the high amount of effort it required.