Perform the Indicated Calculation $\left(3 \times 10^{9}\right)\left(8 \times 10^{9}\right)$ A) $2.4 \times 10^{18}$

Multiple Choice

Perform the indicated calculation. Express your answer using scientific notation.
- $\left(3 \times 10^{9}\right) \left(8 \times 10^{9}\right)$

A) $2.4 \times 10^{18}$
B) $24 \times 10^{81}$
C) $24 \times 10^{19}$
D) $2.4 \times 10^{19}$