meaning of the final disaster

[Limbo]

English Idioms and Expressions, Advanced Level

ESL/EFL Test #3 "Lucky Alex", question 6

As far as Alex was concerned this was the last straw and he vowed he would never risk money on a horse ever again.

(a) the final decision
(b) the final moment
(c) the final disaster
(d) the final occasion

English Idioms and Expressions, Advanced Level

ESL/EFL Test #3 "Lucky Alex", answer 6

As far as Alex was concerned this was the final disaster and he vowed he would never risk money on a horse ever again.

Correct answer: (c) the final disaster
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what the meaning of the final disaster?

pls thanx
Limbo

[Mister Micawber]

.
the last very bad thing to happen.
.
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Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mr. Micawber