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The ratio of the number of seniors to the number of non-seniors is 3 to 5.

In a group of 160 students, with 60 being seniors, the number of non-seniors is 100. Therefore, the ratio of seniors to non-seniors is 60 to 100, which simplifies to 3 to 5.

A) 3 to 4

This option is incorrect because the ratio of 3 to 4 implies that for every 3 seniors, there are 4 non-seniors, which would suggest a total of 7 students. Given there are 60 seniors and 100 non-seniors, this ratio does not accurately reflect the numbers.

B) 3 to 5

This option is correct. The ratio of seniors (60) to non-seniors (100) simplifies to 3 to 5, as 60 divided by 20 equals 3, and 100 divided by 20 equals 5, perfectly matching the proportions of the groups.

C) 3 to 8

This option is incorrect because a ratio of 3 to 8 would mean for every 3 seniors, there are 8 non-seniors. This would total 11 students, which does not align with the actual numbers of 60 seniors and 100 non-seniors.

D) 3 to 11

This option is also incorrect. A ratio of 3 to 11 suggests that for every 3 seniors, there are 11 non-seniors, totaling 14 students. This does not correspond to the actual figures of 60 seniors and 100 non-seniors.

Conclusion

The correct answer, 3 to 5, accurately represents the relationship between seniors and non-seniors in the group of students. All other options fail to reflect the actual proportions derived from the numbers provided, making them invalid choices in this context.