Final answer:
The earliest opportunity for the volunteers to put up the signs is Saturday.
Step-by-step explanation:
To determine the earliest opportunity for the volunteers to put up the signs, we need to consider the availability of each volunteer and the days they can help. Ike can only help on Fridays or at the weekends. Kelly and Alisa can't volunteer during the working week, but one of them can make time for whichever day is chosen. Tom can help any day except for Friday. Since at least 3 people are needed to put up the signs, we can look at the available days when 3 or more volunteers can help.
From the information given, Ike can help on Fridays and weekends, Kelly or Alisa can make time for any day, and Tom can help on any day except for Friday. Therefore, the earliest opportunity for the volunteers to put up the signs is Saturday. This makes the statement 'The earliest opportunity for the volunteers to put up the signs is Saturday' True.
Learn more about Volunteer availability here: