C. 10
We are given that Rolanda has a total 25 flowers, and will plant 2/5 of those 25 flowers today.
This means that we need to find 2/5ths of 25.
Multiply 2/5 by 25.
2/5 * 25 = 50 / 5 = 10
So, this means Rolanda will plant 10 flowers today. The answer is C.
We can confirm that 10 is 2/5 of 25 by dividing 10 by 25:
10/25 = 2/5