They was sheathed on The purple option .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 They)) (VP_4 (VBD_1 was) (VP_2 (VBN_0 sheathed) (PP_0 (IN_1 on) (NP_6 (ATNP_1 (DT_0 The) (JJ_1 purple)) (NN_1 option)))))) (DOT_0 .)))