PLEASE ANSWER
Destiny was comparing the number of text messages she sent last month to the number of text messages she received. The ratio was 3:7. Which statement about her text messages last month MUST be true? *
A. Destiny sent and received a total of 10 messages last month.
B. For every text message Destiny sent, she received 2.5 text messages.
C. If Destiny sent 60 text messages last month, then she received 140 text messages.
D. If Destiny sent and received a total of 100 text messages last month, then she must have sent 70 of them and received 30 of them.