The correct answer is option B, that is, sarcomeres.
Striated muscle tissue refers to a muscle tissue, which demonstrates repeating units known as sarcomeres, in comparison to the smooth muscle tissue that does not exhibit sarcomeres.
The existence of sarcomeres manifests as an array of bands noticeable along the fibers of muscles and is accountable for the striated look witnessed in the microscopic images of the tissue. The striations in muscles are one of the essential characteristics of skeletal muscles.