Which informal fallacy is committed in the following argument: 'The quality of higher education in our country has been declining for years; therefore we can conclude beyond doubt that university teachers are not doing their job these days'?

The argument commits the false cause fallacy.

It treats declining education quality as caused by teachers not working.

The mere decline is offered as proof of that single cause.

Many other factors could explain the fall in quality.

Assigning an effect to an unwarranted cause is the false cause fallacy.