Help me with this :((

Birth attempted to get how Trinidadians regard time by exploring how closely their society links time and money. He surveyed rural residents and found that farmer- whose days are dictated by natural events, such as sunrise- did not recognize the phrase time is money, budget your time or time management even though they had satellite TV and were familiar with Western popular culture. But tailors in the same areas were aware of such notions. Birth concluded that wage work altered the tailor's views of time. The idea of associating time with money are not found globally, he says "but are attached to your job and people you work with".

1. Birth surveyed Trinidadian attitudes to time by:

A. Asking questions connected with language

B. Asking people how they felt about time

C. Observing how people behave in different setting

D. Collecting phrases to do with time.

Anyone know why the answer is A? Please explain Why it's A. I felt so confused because i thought it was C.