Which of the following is evidence of the past existence of glaciers?
a. rift valleys
b. fjords
c. estuaries
d. oceanic ridges

The correct answer is - B. fjords.

The fjords are one of the remnants of the glaciers that existed in the past. They are one of the many glacial relief forms that can give us a nice insight into the size and power of the glaciers in the past. The fjords have been formed by the glaciers that were passing through the steep rocky landscape near the coasts, managed to make them much deeper and wider, and they became very long linear shaped valleys with steep sides. As the climate was warming and the sea levels were rising, the low valleys have been flooded with sea water, so they became like inland canals with very high steep sides.

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d is the logical answer but im not a 100% sure