Pick out the correct sentence having Adverb of Manner :

Shikha cried bitterly

Here's why:

• They went everywhere describes the direction of their going, not the manner.
• He will come again tells us when he will come, not how he will come.
• I therefore left my apartment explains the reason for leaving, not the way of leaving.
• Shikha cried bitterly describes how Shikha cried, emphasizing the intensity of her crying. "Bitterly" is an adverb of manner modifying the verb "cried."

Therefore, "Shikha cried bitterly" is the only sentence that contains an adverb of manner.