How would the h-zone in a contracted sarcomere differ from that of a relaxed sarcomere?

The H-zone in a contracted sarcomere differ from that of a relaxed sarcomere because H-Zone is narrower in contracted sarcomere. In a striated muscle sarcomere is small unit of myofibril.  Between two Z line sarcomere is the repeated unit . Sarcomere is the very basic unit that makes up our skeletal muscle.

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.