Final answer:
The correct answer is option b. The minimum length required for the project report is 4-6 pages.
Step-by-step explanation:
The minimum length required for the project report is b) 4-6 pages. According to the given information, the project report should be 10-12 pages, double-spaced, with standard one-inch margins. Since double-spacing is required, the actual number of pages will be half of the word count.
So, if we assume an average of 250 words per page, a 4-6 page report would have 1000-1500 words, which is within the expected range. It's important to follow the specific formatting requirements provided by your instructor to ensure your report meets the necessary criteria.