Which of the options may be included in a poster on the given topic:
'Urging people to stop using plastic'
This question has multiple correct options

We can conclude that the below- given judgment is trying to express a communication that people need to stop using plastic, as plastic is veritably dangerous to our mama earth. 
A bill which helps people to understand the adverse goods of plastic on the terrain are listed in all the four options. 
We can also see creative lines on the ban of using plastic in the form of taglines and sorting words in the options b andc. 
The bill will convey a social communication in an eye- catching way, if all the four options given are included in it, thus all the listed options are correct and can be included in the bill timber.