Hijacking planes or planting bombs in trains, cafes, markets, and other crowded places relates to which of the following threat?

Terrorism

The correct answer is Option 1 - Terrorism

Terrorism refers to political violence that targets civilians deliberately and indiscriminately. International terrorism involves the citizens or territory of more than one country.
The classic cases of terrorism involve hijacking planes or planting bombs in trains, cafes, markets, and other crowded places.

Remaining options:

Genocide is the intentional destruction of a whole people. It involves a coordinated plan of actions to eliminate a national, ethnic, racial, or religious group. This can include mass killings, forced displacement, and other acts intended to wipe out the group.

Illiteracy is the inability to read or write.

Lynching is the unlawful execution of an individual by a mob. It is often motivated by racism and prejudice, and victims are typically members of marginalized groups.