During the meeting Shastri said Ranga's cause of worry was a girl whose name should resemble something found in the sea such as pearl (Ratna); Ranga agreed to it and thus their marriage was fixed. The plan clicked. Within no time both Ranga and Ratna were married.

Ranga's concern, according to the Shastri, was for a girl.

Explanation:
The story "The Portrait of a Lady" by Khushwant Singh revolves around the character of Ranga, a young man from a village in Punjab who comes to the city to work as a bus conductor. The Shastri, who is Ranga's mentor and guide, plays an important role in the story.

Ranga's concern for a girl is evident in the story when he confesses to the Shastri that he has fallen in love with a girl named Ratna. Ranga is deeply infatuated with Ratna and is worried about how to approach her and express his feelings. He seeks guidance from the Shastri, who advises him on matters of love and relationships.

Ranga's concern for a girl is a significant aspect of the story as it highlights his transition from a naive village boy to a young man experiencing the complexities of love and relationships. It reflects his desire for companionship and his longing to connect with someone on an emotional level.

This concern also showcases Ranga's innocence and vulnerability in matters of the heart. Being a village boy, he is unfamiliar with the ways of the city and lacks the confidence to express his feelings to Ratna. The Shastri, being older and wiser, provides him with advice and guidance to navigate through the complexities of love.

In conclusion, Ranga's concern in the story "The Portrait of a Lady" is for a girl named Ratna. This concern reflects his longing for companionship and his inexperience in matters of love. The Shastri plays a crucial role in guiding Ranga through this emotional journey.

Option A is the correct answer in this question