Question

read these sentences.
many of philadelphia’s residents left the city when they heard about the yellow fever outbreak. others locked themselves in their homes. ____ action guaranteed their safety.
choose the correct transition word.
○ therefore
○ however
○ but
○ neither

Explanation:

We need to find a transition word that shows a contrast between the two actions (leaving the city and locking themselves at home). "However" is used to introduce a contrasting idea. "Therefore" shows a cause - effect (result), "But" is usually used to connect two clauses more directly (often without a comma before it in this context), and "Neither" is used for negative correlations. So "However" is the correct transition word as it contrasts the two different responses of Philadelphia's residents to the yellow fever outbreak.

Answer:

However