Choose one of the sentences with the correct use of capital letters

Choose one of the sentences with the correct use of capital letters
Past Papers: Board of Revenue (BoR) — Past Paper MCQs BoR Naib Tehsildar — Past Paper MCQs PPSC Past Paper MCQs (2005–2025)
A: you are my best friend she said and I have no doubt about it
B: You are my best friend she said and I have no doubt about it
C: You are my best friend she said And I have no doubt about it
D: You are my best friend she said and I have no doubt about it

The first word of a sentence requires capitalization and the pronoun I must be capitalized. Option B capitalizes You at the beginning and I within the sentence. Option A fails to capitalize at the start. Option C wrongly capitalizes And mid sentence. Option D fails to capitalize the pronoun I.