This character has a rich inner life, and is committed to their fantasy of marrying a particular person they never even met until Act II.

Jack
Algernon
Gwendolen
Cecily
Lady Bracknell

say the correct answer and explain

The correct answer to the question is Algernon.

To arrive at this answer, we need to analyze the given information about the character's rich inner life and their commitment to fantasizing about marrying a specific person they haven't met until Act II.

In the play "The Importance of Being Earnest" by Oscar Wilde, Algernon is a character who fits this description. Algernon is an aristocratic and witty young man who lives a carefree life in London. He develops a fantasy about marrying a woman named Cecily, whom he has never met but has only heard about from his friend Jack.

Algernon's rich inner life is evident through his imagination and willingness to create a detailed narrative about Cecily, even though he has no real knowledge or personal connection to her. He becomes committed to this fantasy, even going so far as to pretend to be someone named "Bunbury" in order to escape his social obligations and visit Cecily in the countryside.

It is important to note that while Jack also invents a fictional persona named Ernest to pursue his own romantic interests, he does not meet Cecily until Act II of the play, whereas Algernon's commitment to his fantasy of marrying Cecily predates their actual encounter. Therefore, the answer is Algernon.