The swahili coast developed its own unique culture that
a. was influenced by a mix of other cultures.
b. existed before other cultures were present in the region.
c. no longer exists in the region today.
d. initially emerged in isolation from other cultures.

B. existed before other cultures were present in the region.

The Swahili Coast is a region in Southeast Africa inhabited by the Swahili people. It includes the coast of Kenya, Tanzania, and northern Mozambique, as well as Zanzibar, Pate and Comoros. The Swahili people originated from Bantu inhabitants at the outset of the first millennium. The Swahili people engaged in long-distance trade in the Indian Ocean from the 5th century up to the 11th century. Modern Swahili speak the Swahili language as mother tongue, a member of the Bantu subgroup of the Niger-Congo family.

are their options?

otherwise i can't

i confess that there are several parts of this constitution which i do not at present approve, but i am not sure i shall never approve them: for having lived long, i have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which i once thought right, but found to be otherwise. it is therefore that the older i grow, the more apt i am to doubt my own judgment, and to pay more respect to the judgment of others.