A proposition is a declarative sentence that can be classified as either true or false. Questions, commands and exclamations do not qualify because they do not assert anything with a truth value. “Is it raining outside?” is an interrogative sentence that seeks information rather than stating a fact. Therefore, it cannot be evaluated as true or false in its own right and is not a proposition.
Option A:
Option A is a factual statement about a number that can be checked as true or false and therefore is a proposition.
Option B:
Option B asserts a general claim about birds that may be false in reality but still has a truth value, making it a proposition.
Option C:
Option C is a question and does not assert a claim, so it lacks a truth value and falls outside the class of propositions.
Option D:
Option D is a factual statement about boiling point under specified conditions, which again can be evaluated as true or false and thus is propositional.
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