In eukaryotic cells, the timing of the cell cycle is regulated by?

Cyclin-dependent kinases, or CDKs. Cyclin-dependent kinases trigger the transition between cell cyclephases by phosphorylating substrates within the cell.

In eukaryotic cells, the timing of the cell cycle is regulated by cyclin-dependent kinases, or CDKs. Cyclin-dependent kinases trigger the transition between cell cyclephases by phosphorylating substrates within the cell.

i did this question earlier on a test

The correct answer is- C) Angiosperms.

Angiosperms are also called flowering plants as they produce flowers. They can be described as seed possessing plants where the ovule, present within ovary, is converted into seed and ovary (present within flower) is converted to fruit after fertilization. Fruits are developed from the maturation of floral organs of these plants.  

Thus, C) is the right answer.