ATPL - What is the main adverse effect of expectations in the perception mechanism ?

Question id 73 - Human Performance and Limitations - ATPL - Airline Transport Pilot license

Expectations often guide the focus of attention towards a particular aspect, while possible alternates are neglected

The attention area is enlarged, thus it will lead to an uncertainty in regard to necessary decisions

The unconscious mechanism of attention leads to focus on all relevant information

They always lead to routine errors