Hello there!
It would be B. Second degree.
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The first line of defence (or outside defence system) includes physical and chemical barriers that are always ready and prepared to defend the body from infection. These include your skin, tears, mucus, cilia, stomach acid, urine flow, 'friendly' bacteria and white blood cells called neutrophils. Hope this helps.
Answer: approximately $5.7 million increase.
Explanation: If 50 days earns us a 0.075 return, then we can think of 50 days as t=1. Then 50 days = 45 x 0.075 1 return and 40 days = 45 x 0.075 = 5.6658 million