[Belloq waits, pleased that someone else is going ahead. If there are deadly traps, he'd rather someone else spring them. When she returns, and presents the options, he thinks it over.]

I like option number three. Walking right by a monster would be foolhardy, but the advantage of the path with the monster is that the monster itself would have tripped any floor traps on that route if there were any. The second path is unknown and untried.