Answer:
Available.
Step-by-step explanation:
The word "intense" refers to any tone or approach, or attitude that is serious, fierce, fervent, earnest, etc. In other words, intense refers to anything that is serious and extreme, an attitude that is not relaxed or calm.
Considering the given words in the option, "available" is relaxed as compared to the others. It makes it sound as if there is no rush or emergency required, whereas the others such as "dangerous, lost, last time" all show or express a tone of urgency and seriousness.
Thus, the correct answer is available.