The correct active/passive form of the given sentence is **Rahul said to me, “I am going to watch a movie this week.”

The sentence is in the simple present tense, which is used to describe an action that happens regularly or now. The active voice of the sentence is formed by putting the subject of the sentence before the verb and removing the word "by." In this case, the subject of the sentence is "Rahul" and the verb is "say." So, the active form of the sentence is "Rahul said to me, “I am going to watch a movie this week.”"

The other options are incorrect because:

• Rahul told me that he was going to watch a movie that week.” This is the original sentence in the active voice.
• Rahul says to me, “I am going to watch a movie this week.” This is correct, but it is in the present tense, which is not consistent with the rest of the sentence.
• Rahul said to me, “He was going to watch a movie this week.” This is incorrect because the verb "was" is in the past tense, but the sentence says that Rahul is going to watch a movie this week.
• Rahul said to me, “I am going to watch a movie that week.” This is incorrect because the word "that" refers to a specific time in the past, but the sentence says that Rahul is going to watch a movie this week.