Who were the prominent leaders of the remain campaign during the Brexit referendum?

The prominent leaders of the remain campaign during the Brexit referendum were David Cameron and George Osborne, making this the correct answer. David Cameron, as the Prime Minister at the time, played a significant role in advocating for the United Kingdom to remain in the European Union, promoting the benefits of EU membership to the public. George Osborne, who served as Chancellor of the Exchequer, supported these efforts by presenting economic arguments that highlighted the potential negative impacts of leaving the EU on the UK economy. Together, they helped to lead the official campaign known as "Britain Stronger in Europe."

The other choices present alternatives that do not accurately reflect the leaders of the remain campaign. Tony Blair, a former Prime Minister, was not an official leader of the campaign, and while he did support remaining, he was not publicly involved in the referendum campaign at that time. Boris Johnson, along with others, was a prominent leader on the leave side, making his inclusion alongside George Osborne incorrect. Lastly, while Jeremy Corbyn and Theresa May were significant political figures, their positions and roles in relation to Brexit did not align with leading the remain campaign.