Why might the action of the seljuks in conquering southwest asia have ignited the christian crusades?

the greek christians had a falling out with the seljuks over trade policies.
the umayyads in spain were conspiring to overrun the seljuks with christian armies.
the seljuks conquests had cut off europe from access to jerusalem.
the christians of europe were offended by seljuk policies within byzantine lands.

can't without checkbox

well let's see i know a little about the fall of the roman empore but what to say i do not have a clue of what to say. (that's 28 words) i learned about it in social studies it was quite boring really my teacher talks a lot, like a lot then gives us a bunch of work sheets not too many though.( that's 60 words)i actually almost fell asleep in class of course i really like that teacher of course she is really nice. i actually don't remember much from that class i got a b without any notes (it was an open notes test)(that's 95 words) i'm wasting time but i've gone too far to stop now i'm sorry i haven't said really any thing on the topic at all sorry not sorry haha jk.(that's 125 words ) (mike drop)