Difficulty: Easy
Correct Answer: protest against
Explanation:
Given sentence
Most donors would seriously protest any effort to extrapolate from such limited data.
Concept/Approach
When the object is an action/proposal, the collocation is protest against (e.g., protest against a decision). 'Protest to' is used with a person, and 'protest at' is less common/BrE-specific for places or events.
Correction
protest against any effort …
Final Answer
protest against
Discussion & Comments