I think the answer would be A. Increased blood pressure.
No 6 is common for N and H. 3 is only for H(Hydrogen).
For finding the number of hydrogen atoms we should multiply 6 with 3
So, 6*3 = 18. So there will be 18 hydrogen atoms in 6NH₃
Because of the moons gravitational pull, is strong enough to pull the ocean around... I hope that helps!
