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Which one of the following can exhibit cis-trans-isomerism?

(a) ${\mathrm{CH}}_{3}-\mathrm{CHCl}-\mathrm{COOH}$

(b) $\mathrm{H}-\mathrm{C}\equiv \mathrm{C}-\mathrm{Cl}$

(c) $\mathrm{Cl}-\mathrm{CH}=\mathrm{CHCl}$

(d) ${\mathrm{ClCH}}_{2}-{\mathrm{CH}}_{2}\mathrm{Cl}$