I promise the answer is d because I just finished this unit in school and had this exact question and it marked me right when I picked d.
Answer:
The numbers 1 through 10 represent Paleozoic sedimentary rock layers.
Explanation:
D. All of the above
There wasn't really a cheap way to travel in the early and even late 1800's (unless you walked)
Apartheid and the Indian caste system both imposed strict hierarchical structure on the society, which limited opportunities to people of lover caste/ groups (In South Africa no group was officially superior to others, but in reality while people had access to better infrastructure than the other groups).
