2 Points
When historians talk about the past, they are referring to events that:

They are referring to things that happened before what is currently happening. This could be 100 years in the past or just yesterday but its in the past

Explanation:

a is the final : )

most people now work in jobs where they do one  kind  of work; they are carpenters, bankers, cooks, mechanics, and so forth. likewise, most  businesses produce  only certainkinds  of  goods  or  services, such as cars, tacos, or gardening  services. this feature of  production  is known as specialization.