A. severing the thread on the loom's shuttle whenever Mencium neglected his lessons to make him understand the need to persevere.
B. severed the thread on her loom's shuttle whenever Mencius neglected his lessons to make him understand the need to persevere.
C. severed the thread on her loom's shuttle whenever Mencius neglected his lessons to make him understand the need for preserving.
D. severing the thread on her loom's shuttle whenever Mencius' neglected his lessons, to make them understand the need to persevere.