Which word fits “the sudden … of the quiet routine of his life”?

Question

He is still suffering from the sudden ... of the quiet routine of his life.

Answer choices

1. disturbance
2. disconnection
3. mixing
4. trouble

Explanation

Disturbance means a disruption of his usual peaceful way of life. It naturally fits “the quiet routine” in this context.

Disconnection means separation or loss of a connection; mixing means combining things. Trouble means difficulties or problems, but does not fit this construction as precisely.