A noun would fit in the blank after the determiner 'their', so the adjective 'sagacious' (having or showing keen mental discernment and good judgment; wise or shrewd) is eliminated. Since the sentence is about beliefs and views on the African spirit world, 'assets' is contextually a misfit. 'Insights' (an accurate and deep understanding) is the apt choice.
Hence, option (e) is correct.
NOTE:
Possessive Adjectives: Words like my, our, your, his, her, its, and their are known as possessive adjectives (or determiners). They come before nouns and indicate ownership of the noun. Example: "The teacher asked the students to open their drawing books."
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