The antidote to these problems is hard to find.

The correct answer is A. remedy.

A remedy is a cure or treatment for a disease or ailment. In this case, the speaker is looking for a way to solve the problems they are facing. The other options are not correct because:

• A consequence is an effect or outcome of an action.
• A cause is something that brings about an effect.
• A result is the final outcome of something.

Here are some examples of remedies:

• Aspirin is a remedy for headaches.
• Antibiotics are remedies for bacterial infections.
• Surgery is a remedy for some medical conditions.

I hope this helps! Let me know if you have any other questions.