Fill in the blank with the most appropriate word. Millions of people ____to London for her Funeral when she died.

The correct answer is C. Came.

The sentence is in the past tense, so the verb must also be in the past tense. The other options are not in the past tense.

• Come is the present tense form of the verb.
• Coming is the present participle form of the verb.
• Comes is the third person singular present tense form of the verb.

The sentence is about a specific event that happened in the past, so the verb must be in the past tense. The other options are not in the past tense, so they are not correct.