Final answer:
Abdul is likely unable to sign in to his computer after changing his password on his mobile device due to Option B, the computer being not connected to the Internet, preventing it from accessing the updated credentials.
Step-by-step explanation:
When Abdul cannot sign in to his desktop computer using his new password after changing it on his mobile device, there are several possibilities. However, the most likely explanation is option B: The computer was not connected to the Internet. When you change your Microsoft account password, the new password is stored online. Therefore, if the desktop is not connected to the Internet, it cannot access the new credential. The computer would attempt to verify the sign-in using the old password cached locally, leading to a failed login attempt.
Option A is unlikely because the Security Accounts Manager (SAM) database is typically used in local accounts, not Microsoft accounts which are verified online. Option C is incorrect since changing a password requires it to be different than the old one. Similarly, option D concerning cached credentials is related to the issue; however, the credentials wouldn't cause the failure but rather the lack of updated credentials due to no Internet connection would.