Which choice completes the text so that it conforms to the convention…

Source Texts

Text

The vertical position of the Sun in the sky at a particular time of day varies throughout the year: due to Earth's axial tilt, it appears higher in the summer and lower in the winter. Axial tilt is not the only factor that affects the Sun's _____ as the eccentricity of Earth's orbit causes its position to vary horizontally as well, resulting in a figure-eight shape called an analemma (if the Sun's position is recorded at the same time of day throughout the year).

Which choice completes the text so that it conforms to the conventions of Standard English?

position, though,

position; though,

position, though

position, though;