The deterioration is defined as the worsening of situation in terms of health in the above case.
The other words such as grow and improve are denoting enhancing of good health of patient in the above case. Therefore, the correct meaning of “deterioration” is “worsen”.
Thus, the options (a), (b) and (d) are incorrect.
The other words such as grow and improve are denoting enhancing of good health of patient in the above case. Therefore, the correct meaning of “deterioration” is “worsen”.
Therefore, the correct option is – C. worsen.