Key Idea : The carbon which is more electrophilic in nature, loses an $\alpha-\mathrm{H}$ with a base more readily.
Among the given compounds, carbonyl carbon ($>\mathrm{C}=\mathrm{O}$) ie, ketone is more electrophilic in nature, thus loses an $\alpha-\mathrm{H}$ with a base $e g$, in aldol condensation reaction $\alpha$-hydrogen atom of aldehyde or ketone is abstracted by a strong base.