Absolutely yes. However, class C embryos present lower implantation rates than class A and B embryos, as their development was inadequate, or they present certain characteristics that may compromise their viability to some extent.
Since the quality of these embryos is poor, in most cases they are cultured for a few days in order to monitor their development. If they grow adequately, they could be cryopreserved. However, if their development stopped, they would be discarded and qualified as unviable.