It's noun, most probably.
I think it’s C because your expressing yourself .
Answer:
Explanation:While latent or latency period may be synonymous, a distinction is sometimes made between incubation period, the period between infection and onset of the disease, and latent period, the time from infection to infectiousness. ... During latency, an infection is subclinical.
Princeton's WordNet. reaction time, response time, latency, latent period(noun) the time that elapses between a stimulus and the response to it. latent period(noun) the time that elapses before the presence of a disease is manifested by symptoms
