Select the phrase from the options below that should replace the underlined phrase in the sentence to make it grammatically and contextually correct. If the sentence is already correct, select 'No correction required' as your answer. The team leader backed on his colleagues to complete the project on time.

The phrasal verb "backed up" means to support or assist someone, which fits the context of the sentence where the team leader relied on his colleagues to complete the project. Backed out – Means to withdraw from an agreement or commitment (e.g., "He backed out of the deal at the last moment."). Backed away – Means to move backward, usually due to fear or hesitation (e.g., "She backed away from the barking dog."). Backed down – Means to concede or give up a stance in an argument or conflict (e.g., "He backed down after realizing he was wrong.").