Choose the correct option.
𝒀𝒐𝒖𝒓 𝒎𝒐𝒕𝒉𝒆𝒓'𝒔 𝒔𝒊𝒔𝒕𝒆𝒓 𝒊𝒔 𝒚𝒐𝒖𝒓 ________.

• 𝐚𝐮𝐧𝐭
• 𝐜𝐨𝐮𝐬𝐢𝐧
• 𝐬𝐢𝐬𝐭𝐞𝐫