What phrase indicates that Albert had to retire due to health reasons?

The phrase "because of" indicates a causal relationship between two events, which is essential in understanding why Albert had to retire. When someone retires due to health reasons, it suggests that there is a specific cause—his health condition—that led to this decision. "Because of" explicitly connects his health issues to the action of retiring, making it clear that his health was the determining factor.

The other phrases do not convey this causal relationship. "In spite of" suggests doing something regardless of a particular condition, "thanks to" implies a positive outcome attributed to a particular reason, and "in light of" means considering certain information that might influence a decision, but none of these phrases appropriately capture the necessity implied by health-related retirement.