Answer : The correct option is, (B) 54.3 Btu
Explanation :
The conversion used from Joules to Btu is:
1 Btu = 1055.06 J
or,
[tex]1J=\frac{1}{1055.06}\text{ Btu}[/tex]
As we are given that the energy 57281 J. Now we have to determine the energy in Btu.
As, [tex]1J=\frac{1}{1055.06}\text{ Btu}[/tex]
So, [tex]57281J=\frac{57281J}{1J}\times \frac{1}{1055.06}\text{ Btu}=54.3\text{ Btu}[/tex]
Therefore, the correct option is, (B) 54.3 Btu
