Unfortunately, I believe it will affect your chances getting accepted to CSULB. This link states that each course must be completed with a C or better: http://web.csulb.edu/depts/enrollment/admissions/college_prep.html
Since you are a senior, it may be too late for you to make up the D. However, what is your UC/CSU GPA on your official transcript? I think if your UC/CSU GPA is impressive (4.0 range) maybe your D will be overlooked. Is this also the only D on your transcript? If yes, I read a post from 2009 (pretty outdated) that UCs at the time were actually accepting D- or higher. I don’t know if that comment is reliable now, but I think personally that you might have a shot somehow. I know HS graduates that been accepted to UCs with Ds on their transcripts, but it may depend on how many Ds are on there.