It’s the fourth answer option
I'm not 100% sure that this is right but I think D. is correct.
Answer:
Methylpropane has the lowest molecular mass among all of the given compounds. Thus, 2-Methylpropane has the lowest boiling point among the given options.
The rubber structure beneath a building prevents it from being damaged during earthquakes by ABSORBING VIBRATIONS.
Rubbers are used in buildings and other structures not only to help in absorbing vibrations but also to assist the structure in coping the thermal expansion it undergoes.