A. Choose A, B, C, or D for the correct answer.

The following dialog is for questions 8 to 10.

Mrs. Lia: O, gosh. Are you playing online games while recharging your smartphone?

Tora: Yes. What's the matter?

Mrs. Lia: You mustn't do it. It's very dangerous, you know.

Tora: Only a few minutes, please.

Mrs. Lia: I say no. You must stop playing now. Otherwise, you may have an electrical shock.

Tora: O.K. I'll turn it off now.

Mrs. Lia: Never do it again, O.K.? It's for your safety.

Tora: I won't. Thanks for reminding me

Mrs. Lia says, "It's for your safety."

The underlined word is closest in meaning to ....