Add $1299 \mathrm {~g}$ And $45.1 \mathrm {~kg}$ And Express Your Answer in Milligrams (Mg) to the Correct

Multiple Choice

Add $1299 \mathrm {~g}$ and $45.1 \mathrm {~kg}$ and express your answer in milligrams (mg) to the correct number of significant figures.

A) 4.64 × 10⁷ mg
B) 4.64 × 10⁴ mg
C) 4.64 × 10⁵ mg
D) 4.64 × 10⁶ mg