Explanation:

- The word "Abruptly" means something happening quickly and without warning.

- Option 1: Break - This usually means to split or fracture something, not related to speed or suddenness.

- Option 2: Suddenly - This directly relates to something happening quickly and without warning, similar to "abruptly".

- Option 3: Tenuous - This refers to something being weak or thin, not related to speed.

- Option 4: Surprisingly - While similar, this focuses more on being unexpected rather than on the quickness or speed.