When copper is heated with concentrated ${\mathrm{HNO}}_3$ it produces:

Nitric acid and copper react to generate cupric nitrate, a deadly reddish-brown gas with an offensive pungent odour. Pure copper has a pinkish-orange colour when it is first exposed to the air. ${\mathrm{HNO}}_3$ is a corrosive mineral acid. In its purest form, it is colourless, but older samples develop a yellow cast as a result of breakdown into nitrogen oxides and water.

Other names for HNO3 include nitric acid, aqua fortis, and spirit of niter. Fuming nitric acid is another name for it. It frequently functions as a potent oxidising agent.
Concerning the reaction of nitric acid and copper, concentrated nitric acid oxidises copper to form ${\mathrm{Cu}}^{2+}$ ions. Nitrogen dioxide, toxic brown gas with an offensive odour, is created when nitric acid is decreased. In this reaction, cupric nitrate, $\mathrm{Cu}{\left({\mathrm{NO}}_3\right)}_2$, is also produced. The reaction is as follows:
$\mathrm{Cu}+4{\mathrm{HNO}}_3\to \mathrm{Cu}{\left({\mathrm{NO}}_3\right)}_2+2{\mathrm{NO}}_2+2{\mathrm{H}}_2\mathrm{O}$

Hence, the correct answer is option A.