I believe the answer is the 3rd option Thermal conductivity. Hope this helps.
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The answer would be <span>1.800.000 humans</span>
Answer:

Step-by-step explanation:
The potential in a region between x = 0 and x = 6.00 m is V = a + bx.
Put a = 15.4 V and b = -5.10 V/m.
So, 
To find: Potential at x =0, 3, 6
Solution:
Potential at x = 0:

Potential at x = 3:

Potential at x = 6:

Therefore,

The ratio in it's lowest form is 7:4
D = T2 - T1
d = 9 - 14
d = - 5
T40 = 14 + 39(-5)
= 14 - 195
= - 181