Select a Counterexample for the Given Invalid Argument

question 237

Multiple Choice

select a counterexample for the given invalid argument.
-1. (∀x) (Mx ⊃ Nx)
2) (∃x) (Mx • Ox)
3) Oa / Oa • Na

• A) Counterexample in a domain of 2 members, in which: Ma: False Na: False Oa: True
• Mb: True Nb: False Ob: True
• B) Counterexample in a domain of 2 members, in which: Ma: False Na: False Oa: False
• Mb: True Nb: False Ob: True
• C) Counterexample in a domain of 2 members, in which: Ma: False Na: False Oa: True
• Mb: True Nb: True Ob: True
• D) Counterexample in a domain of 2 members, in which: Ma: True Na: True Oa: True
• Mb: True Nb: True Ob: True
• E) Counterexample in a domain of 2 members, in which: Ma: False Na: False Oa: True
• Mb: False Nb: True Ob: True

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