Which of the following are the products of redifferentiation?

The correct option is A Guard cells

Redifferentiation is the event of losing the ability to divide by dedifferentiated cells, the plant tissue culture is an example of redifferentiation in which parenchyma cells are made to divide under controlled laboratory condition.

Interfasicular cambium and cork cambium are also examples of redifferentiation.

As guard cells are parenchymatous cells, which divide and then matures, it can also be considered as the example or product of it.