126.

∫ All four corners of the previous page are restored 18 times (every 18 times, all corners return to their original positions).

And all four edges of the previous page are restored 14 times (all edges are restored to color every 14 times).

∴ The number of times required for recovery must be a common multiple of 18 and 14.

∴ The minimum number of times required for simplification is the least common multiple of 18 and 14, that is:

2×7×9= 126 (times)

A: The minimum number of times required for recovery is 126 times.