The correct option is B take after
The context refers to someone having the same colour eyes as her aunt. To "take after" someone is to resemble them. Thus, option A is correct.
To "take off" is to depart hastily.
To "take away" is to remove something from someone's possession, so that they no longer possess it or have it with them.
To "take for" (something) is to regard as (something).
Thus, option A is correct.