Think of the word casual when trying to fill in both
blanks: her paintings will not seem precise and deliberate and painstaking.
Starting with the first blank, craft and accomplishment imply something
painstaking, so throw those out. Deception doesn’t have to do with
painting at all, so throw it out, too. Improvisation and spontaneity
both imply something casual and easy; leave those. The second blank,
too, needs to convey an execution that isn’t difficult. Diligent
does imply something that is difficult, so throw it out. The right
answer is C, spontaneity and rapid.