Q79
Single choice
Bird-watchers explore a forest to see which of the following six kinds of birds -- grosbeak, harrier, jay, martin, shrike, wren -- it contains. The findings are consistent with the following conditions:
If harriers are in the forest, then grosbeaks are not.
If jays, martins, or both are in the forest, then so are harriers
If wrens are in the forest, then so are grosbeaks
If jays are not in the forest, then shrikes are If grosbeaks are in the forest, then which one of the following must be true?