The greatest strain, when lifting a load with the jumbo purchase, is on __________.

Correct Answer: Option B — the hauling part because it must absorb the frictional losses of all the sheaves

In heavy-lift jumbo gear, cumulative friction across multiple sheaves requires the hauling part to sustain both the direct load component and the frictional resistance of every sheave in the purchase system, making it the point of greatest mechanical strain.