William shakespeare, macbeth, act l, scene vii what part does lady macbeth play in macbeth's decision to kill the king? ! she calls macbeth weak and cowardly until he finally agrees to her plan to kill the king. o b. she manipulates macbeth to kill the king by telling false stories of duncan's cruelty. c. she admires macbeth's strength and power and tells him what a good king he would be. o d. she asks macbeth to kill the king to make sure that their children will be taken care of.