Options Table and SERIALIZED DATA

In my Options Data Base Table I have a lot of stuff in rows. Some have names like this:

rss_02c7e8c29b74de037a06c168a7a5c873

and other have similar names with _ts at the end.

Some are full of stuff that is of no use that I would like to clean out. It seems to be about wp development. In options.php it just shows up as SERIALIZED DATA. But in php my admin it is full of text.

Can I empty these rows?

Many thanks.