Inherent risks are those that would occur even if there there weren't any controls.
But – They include business risks. AU-C 200.A42 – “External circumstances giving rise to business risks may also in-
fluence inherent risk…Factors .. lack of working capital…declining industry…”
Types of transactions (routine, nonroutine, estimation) affect the level of inherent risk which is correct.
However, since one of the components of an entity's internal control is ‘risk assessment' which includes “how management identifies internal and external events (business risks) relevant to financial reporting” (AU-C 315 A.82), that would help make the answer to this question an increase of control risk rather than an inherent risk.
Why this exam focuses attention on this this and even GAAS doesn't bother to spend much time on the differentiate between Inherent and Control risk is beyond me.
200.A44 – GAAS do not ordinarily refer to inherent risk and control risk separately, but rather to a combined assessment of the risks of material misstatement.