well last night i came clean ... i got really wasted in cleveland and do nt know how i got to the hotel that night then i had a womens number in my phone and pics i could nt explain .

Based on the preceding passage, choose your answer for question Why had the speaker lost their memory about the events of that night in Cleveland ?
Options are:
-They had lost their glasses , and because they could n't make out any details , they had a hard time remembering specifics;
-They had suffered a head injury and as a result had developed retrograde amnesia about the events;
-They had a fair amount to drink , and as a result had suffered a black out in regards to the events of that evening;
-None of the above choices .;
The answer is:
They had a fair amount to drink , and as a result had suffered a black out in regards to the events of that evening