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I believe that is incorrect. A single call is calling for multiple proposals for addressing a single task, hence "A call for proposals". If there are multiple tasks, you emit multiple calls, each a...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/48382 License name: CC BY-SA 4.0 License URL: https://creativecommons.org/licenses/by-sa/4.0/
#2: Initial revision
I believe that is incorrect. A single call is calling for multiple proposals for addressing a single task, hence "A call for proposals". If there are multiple tasks, you emit multiple calls, each asking for multiple proposals. Those are correctly called "calls for proposals". e.g. "These are all the calls for proposals we have published for construction, renovations and repairs on this campus."