Which of these is correct?(1 point)

Responses
(9.9×10^7)(5.8×10^6)=5.72×10^13
(2.9×10^8)(1.3×10^7)=3.77×10^15
(4.6×10^5)(2.1×10^4)=2.5×10
(8.8×10^8)(4.2×10^7)=13×10^15

(2.9×10^8)(1.3×10^7)=3.77×10^15