Final answer:
The correct way to change the direct speech "Did he arrive on time" into indirect speech is by using 'if' or 'whether', matching the tense, and omitting the question mark, resulting in 'Bina asked Bikash whether he had arrived on time.'
Step-by-step explanation:
The question asks for the correct way to convert a sentence from direct speech to indirect speech. The sentence in question is Bina said to Bikash, "Did he arrive on time" When changing from direct to indirect speech, reported questions require the conjunction 'if' or 'whether', and no question mark is used. The correct conversion in indirect speech should also match the tense used in the direct speech.
The correct indirect speech format for the given question is: Bina asked Bikash if he had arrived on time or Bina asked Bikash whether he had arrived on time. Therefore, the most appropriate answer is: c. Bina asked Bikash whether he had arrived on time.