since so Noah guess a only option This .
(ROOT_0 (S_0 (ATS_3 (ATS_1 (ADVP_0 (IN_2 since) (RB_1 so)) (NP_0 (NNP_0 Noah))) (VP_3 (ATVP_4 (VBP_0 guess) (NP_6 (ATNP_1 (DT_0 a) (JJ_1 only)) (NN_1 option))) (ADVP_0 (DT_1 This)))) (DOT_0 .)))