In a manufacturing inspection report, which prepositional phrase correctly completes the clause: 'The cast iron casing is prone ___ microscopic fatigue cracks under cyclic loading'?
Answer and explanation
Correct answer: A. to
- Step 1: The technical adjective 'prone' takes the preposition 'to' (meaning susceptible or vulnerable to an undesirable condition). Answer: to. Why not the others: 'prone with', 'prone for', and 'prone at' are ungrammatical in standard English.
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