The following sentence has an error in its tense. Identify the error and select the correct sentence from the given options.
I will be arrange all the necessary materials for the programme.

`. Let's write out the response cleanly. Error analysis: Original sentence: "I will be arrange all the necessary materials for the programme." Grammar rule: Future continuous tense structure is `Subject + will be + Present Participle (verb + -ing) + Object`. The verb `arrange` should be in its present participle form `arranging` after `will be`. Therefore, the correct sentence is "I will be arranging all the necessary materials for the programme." Let's construct the final output. I will be arranging all the necessary materials for the programme.

The correct answer is "I will be arranging all the necessary materials for the programme."

Explanation:
In the original sentence, "I will be arrange all the necessary materials for the programme," the verb structure following "will be" is incorrect.

Grammar Rule:
When using the continuous/progressive tense (specifically the Future Continuous Tense), the structure must be:
Subject + will be + Present Participle (verb + -ing) + Object

In the given sentence, the base form of the verb "arrange" is incorrectly used after "will be". To correct the grammatical error, the verb "arrange" must be changed to its present participle form, "arranging".

Thus, the correct sentence is: "I will be arranging all the necessary materials for the programme."