Answer: The correct answer is-
DNA molecules or chromosmes are replicated during the interphase.
Interphase is first stage in the cell cycle. It is further divided into three phases that is-
G1 ( first growth phase, during which cell grows and syntheises essential proteins for replication),
S ( synthesis phase as chromosomes are replicated during this phase). This important before cell divides in the M phase.
G2 phase ( second growth phase). During this, further growth of cell takes place and it prepares for division in the next stage that is M phase.