Regional-practice approach:
Pointed gourd is a dioecious vine that is almost always propagated vegetatively so that the sex and fruiting quality of the mother plant are preserved. In the traditional growing belts of eastern India where this crop is most intensively cultivated, the standard field practice is to coil a length of mature vine into a bundle and partially bury it in prepared beds to encourage rooting at multiple nodes at once, a technique specifically named the Lachhi method. The other listed terms, moist lump, ring, and straight vine methods, are not the established, widely documented technique for this crop. Because Lachhi is the technique specifically named in extension literature for pointed gourd, it is the correct answer.