○ 正解です。

Judo, kendo, karate, aikido are not sports, nor are they games. So we do not use the verb to play.
We use the verb to do or to practice.

For example :
Kenji practices judo on Fridays.
I do karate three days a week.

We also use the verbs to do or to practice when we are talking about calligraphy (書道), ikebana or abacus (そろばん).