Select a Counterexample for the Given Invalid Argument

question 259

Multiple Choice

select a counterexample for the given invalid argument.
-1. (∃x) (Gx • Hx)
2) (∃x) (Gx • Jx)
3) (∀x) (Jx ⊃ Kx) / (∃x) (Hx • Jx)

• A) Counterexample in a domain of 2 members, in which: Ga: True Ha: True Ja: True Ka: True
• Gb: True Hb: True Jb: True Kb: False
• B) Counterexample in a domain of 2 members, in which: Ga: True Ha: True Ja: True Ka: True
• Gb: False Hb: True Jb: True Kb: False
• C) Counterexample in a domain of 2 members, in which: Ga: True Ha: True Ja: True Ka: False
• Gb: True Hb: True Jb: True Kb: False
• D) Counterexample in a domain of 2 members, in which: Ga: False Ha: True Ja: True Ka: True
• Gb: False Hb: True Jb: True Kb: True
• E) Counterexample in a domain of 2 members, in which: Ga: True Ha: False Ja: True Ka: True
• Gb: True Hb: True Jb: False Kb: False

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