B or D pretty sure it's D though
Answer:
#4.- 0.6370 squared meters/ 6.8569 squared feet
#5.- 0.4606 squared meters/ 4.9581 squared feet
#6.- 1.5654 squared meters/ 16.8498 squared feet
#7.- 0.4366 squared meters/ 4.7001 squared feet
#8.- 2.1731 squared meters/ 23.3913 squared feet
#9.- 2.0100 squared meters/ 21.6352 squared feet
#10.- 2.2815 squared meters/ 24.5580 squared feet
Explanation:
That system is called the immune system