Acrimony, alimony and an Amway alibi — they all played a role during opening statements as a twisting murder trial got underway Tuesday in Montgomery County. Baldeo Taneja, a 63-year-old doctorate-level biostatistician, and his wife, Raminder Kaur, 64, are accused of driving from Tennessee to Maryland last year to kill Taneja’s ex-wife, Preeta Gabba, 49.