Answer:
A
Step-by-step explanation:
This is because A shows Height/Base = Height/Base. The others are not consistent if you follow the order that the proportion is set up as.
-2.1
Write it laterally (Up and down)
-13.5
<u>- 2.3</u>
-15.8
<u>+ 13.7</u>
Hope this helps :)