The correct option is
C Weakened
The word 'consolidated' refers to making something physically stronger or more solid.
Option A, disjointed refers to lacking a coherent sequence or connection.
Option B, broken refers to something having breaks or gaps in continuity.
Option C, weakened refers to making or becoming weaker in power, resolve or physical strength.
Option D, lost refers to something that has been taken away or cannot be recovered.
Thus, according to the meaning, the word 'weakened' is the most opposite in meaning from the word 'consolidated'.