Q2 - The gu, the hu, and the jue

[jardinsouslapluie5]

I can't figure the arguments are mixing the nec. and suf. condition.
I thought,

Authentic vessels --> incised patterns taotie
~incised patterns taotie
----------------------------------------------------
~Authentic vessels

What am I missing?

[timmydoeslsat]

I can't figure the arguments are mixing the nec. and suf. condition.
I thought,

Authentic vessels --> incised patterns taotie
~incised patterns taotie
----------------------------------------------------
~Authentic vessels

What am I missing?

The first conditional statement you posit is not something this argument has evidence to support.

We know that those 3 types of bronze vessels produced during the Shang dynasty had common characteristics.

Does this mean that to be from the Shang dynasty, you had to have those same common characteristics? No.

Answer answer choice (D) tells us, this argument goes from talking about some members of a group containing certain qualities to inferring that lacking those qualities will not make you a member.