💡 Detailed Explanation
The correct choice is '選ぶ' (erabu - to choose/select). Sentence translation: 'As for the present, you can choose either a red ribbon or a blue ribbon.' 'どちらか' means 'either one (of the two)'. '選ぶ' refers to making a selection from given options. '決める' (kimeru - to decide) is similar, but '選ぶ' is more appropriate when selecting one out of specific physical items. '比べる' (kuraberu) means to compare, and '集める' (atsumeru) means to collect.