Discussion
Why is first order logic preferred to higher order logic in practice?
Answer: B
Completeness means every entailed sentence is provable, which higher order logic lacks under the standard semantics, so automated support is far weaker there. Higher order logic is strictly more expressive and perfectly writable, and neither is decidable. Choosing the formalism for which mechanical support exists, rather than the most expressive available, is the same reasoning that produced description logics at the other end of the scale.
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