Kyle purchased a variable annuity and allocated one-quarter of his $60,000 deposit to the fixed account and the remainder to the separate account, with half placed in a growth fund and the other half in a corporate bond fund. One year later, the growth fund has grown to $35,000, while the bond fund has fallen in value to $10,000. What option will rebalance Kyle's funds periodically as allocations drift because of reinvestments and market fluctuations? A) Call option B) Diversification option C) Reinvestment option D) Asset allocation option