How Did Brahe Measure Highly Accurate Planetary Positions

Multiple Choice

How did Brahe measure highly accurate planetary positions?

A) With the recently- invented telescope.
B) By careful measurements of the brightness of the planets, as seen from Earth.
C) With a new type of telescope that used mirrors instead of lenses.
D) By his invention of the technique know as triangulation (measuring the distance between 2 points, and measuring 2 angles, to determine the distance to a 3rd point) .
E) With larger and more elegant sighting instruments.