Exercício: Qual o significado da expressão em inglês?

He's on a bat means that:

a) He is a show off person
b) he is feeble - minded
c) he's a chatterbox
d) he drunk too much
e) night owl
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He DRINKS too much.

He was on a bat (last week)- he DRUNK too much (last week)
Bat in this case means a "drink bout".

The alternative (E) is also lacking a verb, could be He is a night owl to agree with the verb tense of the others. The way it is, one could say it´s wrongly formulated.