Differences between crash, clash, smash and hash

[patt]

Test No. express/inter-9 "Go ahead", question 1

I'm sorry that looks awful - those two colours don't go together.

(a) smash
(b) crash
(c) clash
(d) hash

Test No. express/inter-9 "Go ahead", answer 1

I'm sorry that looks awful - those two colours clash.

Correct answer: (c) clash

Your answer was: incorrect
I'm sorry that looks awful - those two colours hash.
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what's the difference between theese 4 words: hash, crash, clash, smash.

[Torsten]

To hash means to chop into little pieces.
To smash means to break into pieces.
To crash means to collide with force.
To clash means to bang together or to disagree or conflict and this is what is needed in this context.
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Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary