Kevin and the 4 digits 0️⃣ 0️⃣ 0️⃣ 0️⃣ (Rounding and Place Values)

Kevin multiplies the smallest four-digit whole number by the largest two-digit whole number. What is the answer?

A: 99 000
B: 99 990
C: 990 000
D: 999 900
E: 999 999