7.1x10^3 is 7100.
71,000,000 is 71 million.
The numbers between 7100 and 71 million are:
7100
7200
7300
...
70900
71000
71100
...
70999000
71000000
The following answer choices are between 7100 and 71 million:
7.1×10^6 (71000)
7.1×10^7 (7100000)
Therefore, the correct answers are B) 7.1×10^6 and E) 7.1×10^7.