The scenario states users may be at locations without Wi-Fi or mobile connectivity for their phones, but their laptops have wired Internet. Azure AD MFA methods that rely on the phone's connectivity-Authenticator push notifications or voice calls/SMS-won't work. While the most resilient MFA option in such situations is a time-based verification code from Microsoft Authenticator (works offline), that option isn't among the choices provided. The SC-300 coverage on MFA and legacy clients notes that app passwords can be used for applications that do not support modern authentication/MFA prompts, allowing users to sign in when MFA interaction is impractical. Given the listed options, the only workable method from the remote location is the app password; notification and voice require phone connectivity, and security questions are not an Azure AD MFA method.