Select the most appropriate option to fill in the blank.

Researchers have found that 16 facial expressions ______ universally in similar contexts across 12 world regions.

occur

Researchers have found that 16 facial expressions occur universally in similar contexts across 12 world regions.

Explanation:

• Occur: This is the correct word choice. "Occur" means to happen or take place, and it fits well in the context of researchers finding that certain facial expressions are universally present in similar situations across different world regions.

• Strike: This word means to hit or impact forcefully. It doesn't fit the context of facial expressions occurring across world regions.

• Transpire: This word means to become known or to happen. While it has some similarity to "occur," it's not the best fit for describing facial expressions in this context.

• Befall: This word means to happen to someone, especially in an unfortunate or unexpected way. It doesn't fit the context of discussing universal facial expressions and their occurrences.