Explanation:

Let's break it down stepwise:

- Company C sold 192 digital watches.

- Analog watches = 60% of Company C’s total sales. Let total sales of C = x

So, analogs = 0.6x, digitals = 0.4x = 192 ? x = 480

Analogs sold by C = 0.6 × 480 = 288

- Ratio of total sales A:B:C = 7:9:6

If C is 480, then

A = (7/6) × 480 = 560

B = (9/6) × 480 = 720

- In A, digital:analog sales = 5:3

Total A = 560 ? analogs = 3/8 × 560 = 210

- The sum of C’s analog and digital = analog sold by B

(288 + 192) = 480 analogs sold by B

- Total analogs = A's analogs + B's analogs + C's analogs

= 210 + 480 + 288 = 978

So, option 3. 978 is correct.

Option: 3, 978 is correct