Aboxing tournament is scheduled to start at 8pm local time in los angeles (75 degreewest).at what time should fans in nigeria (15 degree west ) switch on their television to watch the commencent of the match

When standard time is being observed in Los Angeles, the boxing match held at 8 pm local time in Los Angeles it will be on at 5 am the following day in Nigeria.

Explanation:

The time difference between Nigeria and Los Angeles is 9 hours during standard time periods. Nigeria does not observe daylight savings time but Los Angeles and the state of California does, so between March 8th and November 1st, 2020 (the period for daylight savings time this year), the time difference will be 8 hours between Los Angeles and Nigeria.  Therefore, during daylight savings time in Los Angeles, the match would be on at 4 am the next day in Nigeria and that is when those wanting to watch the match should turn their TVs on.  

a and b because with the other three, they simplify to something else.