What advice does the soothsayer give to Caesar?

to not trust anyone
to trust only Brutus
to beware of March 15th
to leave Rome immediately

to beware of March 15th

Explanation:

The soothsayer meets the Caesar in his procession into Rome and asks him to not to go the senate on the 15 of March as he is sure to die on that day if he goes there. The soothsayer does not mention any names or any people to beware of, just a single date that Caesar should avoid.

Importantly, it is a date that Caesar had to go to the senate to deny his crown and to solidify his position more in the senate after his great victory on the frontiers.

the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).

i hope this !

because he wants to address citizens immediate concerns