the homonym of the highlighted word:  The bishop condemned the act as simony, citing canonical law.

Simony is a noun that means the buying or selling of religious offices, privileges, or spiritual benefits.

• Option 1 Uses simony in the same religious sense.
• Option 2 Uses simony in the same religious sense.
• Option 3 Uses simony in a completely different context (alchemy/formulas), making it the intended answer as a different meaning.
• Option 4  Uses simony in the same historical-religious sense.

Answer:

The alchemist failed to explain the simony in his formulas.