I looked up the definition for you. Provided by Oxford Languages
I would say that the most typical stressor here is an unexpected visit. Starting from you feeling uncomfortable about not preparing (dirty flat, etc), you might not want to meet those people and might feel stressed about how to tel them this.
The other options are potential "positive" surprises.
Bello said the Department of Labor and Employment (DOLE) will release a department order prohibiting business owners from requiring their personnel to get vaccinated, following reports that some employees are being required to receive the vaccines
Testing the DNA and RNA of the butterflies and putting them into the computerized system with the name of the specific butterfly along with the sample DNA and RNA of the butterflies can correctly identify each of the species of butterflies and solve that problem.
