Write the Expression in Lowest Terms $\frac{90+54 \sqrt{21}}{63}$ A) $\frac{30+54 \sqrt{21}}{7}$ B) $\frac{10+6 \sqrt{21}}{7}$

Multiple Choice

Write the expression in lowest terms. Assume that all variables represent positive real numbers.
- $\frac{90+54 \sqrt{21}}{63}$

A) $\frac{30+54 \sqrt{21}}{7}$

B) $\frac{10+6 \sqrt{21}}{7}$

C) $\frac{90+18 \sqrt{7}}{7}$

D) $\frac{30-18 \sqrt{7}}{21}$