If the train is delayed, we will have to _________ our travel plans accordingly.
In this context, the sentence indicates a need for a change or modification to the travel plans due to a delay. Let's analyze the options:
- abandon: This means to completely give up. It implies leaving the plans entirely, which might be too drastic for a delay.
- cancel: This means to call off the plans. Similar to abandon, it suggests a complete termination, which doesn't fit the context of simply adjusting to a delay.
- adjust: This means to alter slightly to make suitable for new conditions. It implies a flexible change, which is appropriate for handling a delay.
- oppose: This means to act against something. It doesn't logically fit into the scenario where we are adapting to a schedule change.
Therefore, the correct answer is adjust. We change our plans slightly to accommodate the delay.