Answer: Task demands
Step-by-step explanation: In simple words, task demand refers to the specific activities that an individual or a group who are assigned to perform the task, have to complete in order to make results satisfactory.
It can also be seen as the ability of the entity to perform the task in relation to the needed efforts. A task demand can be any situation or preference like performing the task in a specified time period or maintaining the quality of work as per the predetermined standards etc.
In the given case, Julian's task requires him to make decision quickly and without any information. Hence the reason for his stress is task demands.