It’s time ––– your mistakes.

ক. you realized

- "It’s time you realized your mistakes" is grammatically correct. This form uses the past tense "realized" directly after the subject "you," without any auxiliary verbs. In English, after phrases like "It's time," the base form of the verb or the past tense without any auxiliary is commonly used.

খ. that you realized

- "It’s time that you realized your mistakes" is also grammatically correct but slightly more formal than option ক. This structure introduces a clause ("that you realized your mistakes") following the phrase "It's time." The use of "that" here is optional and adds a slight formal tone to the sentence.

গ. you have realized

- "It’s time you have realized your mistakes" is not grammatically correct. The present perfect tense "have realized" is not suitable in this context. The present perfect tense typically indicates actions or events that have occurred at an unspecified time before now or actions that began in the past and continue into the present, neither of which fits the context of the sentence.

ঘ. you would realized

- "It’s time you would realized your mistakes" is not grammatically correct. The use of "would" here is incorrect because it doesn't fit with the structure needed after "It's time." "Would" is used for hypothetical situations, conditional statements, or future in the past, none of which is appropriate in this context.

So, based on the grammatical rules of English, the correct choice is "ক. you realized" or alternatively "খ. that you realized" for a slightly more formal tone.