assume \ə-'süm\ verb
to take for granted or without proof
to try on or wear something
to take upon oneself, to place oneself in
to pretend to have or be; feign


What is the meaning of the word assume in this sentence?

Hans Fischer will assume the office of Chancellor in the month of April.
A.
definition 3
B.
definition 2
C.
definition 4
D.
definition 1