Why Did Karl Jansky Believe the Source of Radio Static

Why did Karl Jansky believe the source of radio static he was detecting in 1932 was NOT from terrestrial sources?

A) In 1932 there were no strong sources of radio waves on Earth.
B) He could detect the signals coming through Earth as well as from the sky.
C) The radio static was most intense when the Sun was high in the sky.
D) The radio static was most intense when the center of our Galaxy was high in the sky.

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