Answer: The correct answer for the blank is-
in an arm about 75% of the distance from the center of the Milky Way to its outer edge.
The Sun is located in the inside of the Orion Arm, which is a branch of the Sagittarius Arm that is considered to be one of the major arms of grand spiral galaxy ( The milky way) .
The Sun is located about 26,000 ly ( light years) far from the center, which is approximately about 75% of the distance from the center of the Milky Way to its outer edge.
Thus, last option is the right answer.
