Sooo I’m not sure but I think the answer is B and C
Elevation sickness is due to walking or climbing too high so it’s definitely not that
Malaria is cause by mosquitoes (vectors) so it’s Can’t be that either however malaria can spread quicker in hotter areas
Skin cancer is caused by UV RADIATION from the sun (climate factor)
Hypothermia is cause by extremely cold weather (also weather factor)