Answer:
B. Tanzanian
Explanation:
If we break this into how it is pronounced, here is what it looks like (with the stress syllable in bold.)
A. kaan-go --> second syllable
B. tan-zuh-nee-uhn --> third syllable
C. ruh-waan-dn --> second syllable
D. br-oon-dee-uhn --> second syllable
Thus, B. Tanzanian, is the only one with a stress pattern on the third syllable.
