Question

correct the one error.
fire exit
blocking this exit
puts lifes at risk
blocking this exit puts lifes at risk

Explanation:

The error is in the word "LIFES". The correct plural form of "life" is "lives" (since "life" follows the -fe to -ves rule for pluralization: life → lives). So we need to replace "LIFES" with "LIVES".

Answer:

Change "LIFES" to "LIVES" in the sentence "BLOCKING THIS EXIT PUTS LIFES AT RISK", resulting in "BLOCKING THIS EXIT PUTS LIVES AT RISK".