I think the given expression is
[tex] 8s+20st [/tex]
Let's check the first option , which is
[tex] 4s(2+5t) [/tex]
Using distributive property, we will get
[tex] 4s*2+4s*5t = 8s+ 20st [/tex]
Which is same to the given expression. Therefore correct option is the first option .