verb (used with object), ev·i·denced, ev·i·denc·ing. to make evident or clear; show clearly; manifest: He evidenced his approval by promising his full support.

What is the verb form of evidence?

evidence. verb. evidenced; evidencing. Definition of evidence (Entry 2 of 2)

Is evidence a transitive verb?

(3) The cosmic microwave background radiation evidences (intransitive verb) for the expansion of the Universe. I think only (2) is right, because "evidence" is defined in dictionaries as a transitive verb.