An individual purchased an annuity with a series of premium payments continuing over a period...

Detailed Answer in Step-by-Step Solution:

The accumulation period (D) is the phase in a deferred annuity where premiums are paid to build value before payouts begin.

The liquidation period (A) is not a standard term here; it might imply payout but isn’t correct.

The annuity period (B) is when payments are received, not paid.

Period certain (C) refers to a payout option, not premium payment phase.

The Virginia study guide defines the accumulation period as the time during which premium payments are made into a deferred annuity, accumulating value until the payout phase. Reference: Virginia Life, Annuities, and Health Insurance study guide, section on "Annuities."