The cell spends 90 percent of its time performing "everyday" functions, growing and preparing to divide during

interphase

Explanation:

Interphase is the most important phase of cell life cycle where it spends 90 percent its time in regulating the metabolic activities of the cell. In this phase cell undergoes several metabolic activities to maintain the growth of the cell.

There are three phases in interphase G1, S and G2. During this phase cell undergoes several changes that include  cell grows, DNA replicates and prepare itself for mitosis.

Hence, the answer is "interphase".

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c. is the correct answer