Read the following passage and answer the question below.
In the spring of 1904, horologist Julien Mercier published his comprehensive manual on restoring marine chronometers, a work he began writing only after completing the delicate restoration of the HMS Resolution’s clock. Two years prior to that restoration, however, Mercier had discovered the clock’s missing brass escapement wheel in a forgotten crate at the Portsmouth naval dockyards. He did not immediately clean or reassemble the piece; instead, he spent eight months analyzing the alloy’s metallurgical composition to ensure compatibility with modern preservation solvents. Only when those tests concluded in late 1901 did Mercier return to his bench to rebuild the gear train. Interestingly, before he ever set foot in Portsmouth or laid eyes on the escapement wheel, Mercier had served an intensive six-year apprenticeship under master watchmaker Gabriel Laurent in Paris, during which he first conceptualized his non-invasive solvent technique.
According to the passage, which of the following events occurred EARLIEST in Julien Mercier's career?
- Conceptualizing his non-invasive solvent technique during an apprenticeship in ParisAnswer
- BDiscovering the clock's missing brass escapement wheel at the Portsmouth naval dockyards
- CAnalyzing the metallurgical composition of the escapement wheel's alloy
- DRebuilding the chronometer's gear train at his restoration bench