Explanation:

- Company C's sales:

- Sold 192 digital watches.

- Total analog watches = 60% of total sales.

- Let the total sales of Company C be $x$.

- Therefore, $0.6x$ analog watches + 192 digital watches = $x$.

- Simplifies to:

$$x=480$$

- Analog watches = 288.

- Sales ratios:

- Total sales ratio: $A:B:C=7:9:6$.

- Total sales of Company C = 480.

- Total sales of Company A = $\frac{7}{6}\times 480=560$.

- Company A's watch sales ratio:

- Digital: Analog = 5:3.

- Total sales = 560.

- Digital watches = $\frac{5}{8}\times 560=350$.

- Analog watches = $\frac{3}{8}\times 560=210$.

- Percentage of analog watches = $\frac{210}{560}\times 100=37.5\mathrm{\%}$.

- Correct Answer:

- 37.5%