The common noun here is "frog" as the only other noun, Many, is not a common noun - it's a proper noun.
"frog" here is the object of the sentence: it's the object of the verb "caught" of which the subject is Mary
The answer is B) He makes every effort to solve the case.
Either Jermey or John left HIS books in my car.
If I threw myself a surprise party it would be held at a planetarium and I would invite Brian May (guitarist for the band Queen, and astrophysicist) so I could ask him about his life and tell him how much I love his work in all forms (music and science).
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