The correct option is A (1) sew, (2) sow, (3) so
In the first sentence, "Her mother will sew a dress for her", sew is correct as it implies to join or attach by stitches. Sow implies to scatterseedover(land,earth,etc.)forthepurpose of growth. So implies in consequence orhence.
In the second sentence, "He will sow the seeds of a cherry tree in the garden today", sow implies to scatterseedover(land,earth,etc.)forthepurpose of growth.
In the third sentence, "She was late for a show, so she left early", so is correct as it implies in consequence orhence.
Other options are incorrect.