Since Trump lost to Biden in November, he, and his allies have spent more than two months ____________ widespread voter fraud despite repeated failure...
Question
Since Trump lost to Biden in November, he, and his allies have spent more than two months ____________ widespread voter fraud despite repeated failures to ____________ their claim.
COLUMN I
(i) corroborating
(ii) retaining
(iii) alleging
COLUMN II
(iv) substantiate
(v) culminate
(vi) abate