The correct answer is option 3, Time. Initially, Time magazine was highly skeptical of Gandhiji`s Dandi march. However, within a week, the magazine completely changed its opinion and saluted him as a Saint and Statesman.

Option 1, Saturday Evening Post, and option 2, Readers Digest, are not the correct answers. There is no direct evidence or mention of either magazine`s opinion on Gandhiji`s Dandi march in the question. Therefore, we cannot conclude that they were skeptical initially but changed their opinion.

Option 4, Life, is also not the correct answer. Life magazine was not mentioned as being skeptical initially and then changing its opinion to salute Gandhiji.

It is important to critically analyze each option and evaluate the information provided in the question. This helps us identify the correct answer and avoid confusion or incorrect conclusions.