What kind of question are you using when you ask someone ""How long have you been in this field of work?""

The type of question that is mentioned above is "Days/ Time period related questions".

Explanation:

And the answer for that question will be like, "I am here in this field for the past 3 years" where "3 years" is the key answer for this question and hence we can say that it is a "Days?Time period related question.

even though you have attached neither the chart nor the generalizations, i have located them online. the right answer is d, since they are asking you about a generalization. you can only infer from the chart that between 2008 and 2009 the number of employed workers decreased significantly (from over 115 millions to 107 millions approximately), which signals some type of economic crisis.