Art critic: Abstract paintings are nonrepresentational, and so the only measure of their worth is their interplay of color, texture, and form.
Conclusion (Therefore)
Abstract painting can never be a politically significant art form.
Evidence
Abstract paintings are nonrepresentational, but a painting must represent social injustice in a clearly comprehensible way in order to spur the viewer into political action.
Evaluate
Because there are repeating ideas here (abstract paintings / represent vs. non represent / political action vs. politically significant), we could potentially approach this with a Conditional Logic mindset.
If we wanted to represent the Conclusion’s logic path with a long conditional, it would look like this:
Abstract -------------------> not politically Paintings significant art
We would then scan the evidence to see whether we were told any facts about Abstract Paintings, and whether we were provided with a rule that proves “not politically significant art”.
We were given the fact that Abstract Paintings are . We were told that .
That seems pretty definitional, so we don’t need to worry about adding that move. If something is non-representational, then it represents nothing, including social injustice.
Our chain is getting us from abstract paintings to something political, but the evidence only gets us to “won’t spur political action”, not to the conclusion's, “can never be a politically significant art form”.
Do you have to spur someone into political action to be considered a politically significant art form?
Goal
It looks like the missing link here is (or its contrapositive — all politically significant art forms spur people into political action)