The clear property accepts the values none, left, right and: ?

Answer 1

"both" is likely what they want but there are many other options.

https://developer.mozilla.org/en-US/docs/Web/CSS/clear lists the following:
both
inline-start
inline-end
inherit
initial
unset

It was easy to look this up using Google using "css property clear". Mozilla documents all W3C standards for CSS very well.

Answer 2

both

Answer 3

both