Paperbased Test TC

The recent publication of the painter Robert Motherwell’s substantial body of writing, as well as writings by fellow Expressionist Barnett Newman, (i)---------------Ann Gibson’s assertion that the Abstract Expressionists were reluctant to (ii)---------------- issues of artistic meaning in their work and suggests that this supposed reticence was perhaps more artistic (iii)------------------- than historical fact.
A substantiates
B undermines
C overlooks

D forgo
E articulate
F conceal

G conscience
H focus
I posturing

Please explain.