Idiom NOT X BUT Y - X & Y need to be parallel.Most insomnia is not
an illness or a physical condition so much as a symptom of another problem that may simply be a reaction to certain medications, anxiety about travel, or stress before a job interview.
A. an illness or a physical condition so much as a symptom of another problem that may simply be a reaction to certain medications -
BUT is missingB. an illness or a physical condition so much as symptomatic of another problem that may be a simple one, like a reaction caused by certain medications -
BUT is missingC. so much an illness or a physical condition
but a symptom of another problem that may be as simple as when certain medications cause a reaction -
illness - symptom are parallelD. so much an illness or a physical condition, but
it is a symptom of another problem, maybe a simple one like certain medications causing a reaction -
illness - it is an illness - not parallelE. so much an illness or a physical condition but symptomatic of another problem, maybe simply a reaction to certain medications -
illness - symptomatic - not parallelAnswer - C