Simplify the Expression Involving Rational Exponents $-\left(\frac{25}{49}\right)^{1 / 2}$ A) Not a Real Number

B)

Simplify the expression involving rational exponents.
- $-\left(\frac{25}{49}\right) ^{1 / 2}$

A) Not a real number

B) $-\frac{25}{98}$

C) $-\frac{5}{7}$

D) $\frac{7}{5}$