All options are incorrect
Equation will be:
100 * 24 * 80 * 8 = 1536000 (Don't know why people say it is 1636000)
1536000 bits will be downloaded in 1 minutes i.e. 60 seconds and in one second it would be:
1536000 / 60 = 25600 bits
So answer should be 25.6 Kbps