The correct answer is C. impossible.
An ultra is a person who is extremely enthusiastic about a particular activity or cause. They are often passionate and vocal about their beliefs, and they may be seen as being over the top or even fanatical.
It would be very difficult for one person to have a quiet meal with a set of ultras around them. The ultras would likely be talking loudly and excitedly about their cause, and they may even be chanting or singing. This would make it very difficult for the person to have a conversation or enjoy their meal.
The other options are not as accurate. Option A, “unthinkable,” is too strong. It is possible, though difficult, for one person to have a quiet meal with a set of ultras around them. Option B, “undesirable,” is also too strong. It is not necessarily undesirable for one person to have a quiet meal with a set of ultras around them. It may be difficult, but it could also be an interesting or even enjoyable experience. Option D, “unbecoming,” is not accurate because there is nothing wrong with one person having a quiet meal with a set of ultras around them.