In the following sentence, four words have been marked in bold. One of these words may either be spelled incorrectly or used in an inappropriate context. Identify the incorrect word.

It is reasonable to expect that the frequent occurrance of hurricanes in the region would cause a mass departure of inhabitants to a place with a gentler environment.

The correct option is occurrance.

Step-by-step Explanation:

1. Let's analyze the four bold words in the sentence for spelling and context:

- occurrance: This word is spelled incorrectly. The correct spelling is occurrence (ending in "-ence" rather than "-ance").

- hurricanes: Spelled correctly and used in the proper context referring to severe tropical storms.

- departure: Spelled correctly and used in the proper context meaning the action of leaving a place.

- environment: Spelled correctly and used in the proper context referring to natural surroundings.

2. Since occurrance contains a spelling error, it is the incorrect word identified in the sentence.