A very hot, type O star would most likely emit its most intense radiation

Ultraviolet ray

Explanation:

Wien's law gives the relationship between the temperature and the peak wavelength of radiation.

It states that Peak wavelength of radiation is inversely proportional to the temperature of the radiation.

This means a very hot O type star would emit shorter wavelength radiation. Thus, a very hot, type O star would most likely emit its most intense radiation as Ultraviolet. Ultraviolet radiation has smaller wavelength as compared to other given radiation.

It would emit its most intense radiation as ultraviolet light