In a shop, there are 4 dolls of different heights: A, B, C, and D. D is neither as tall as A nor as short as C. B is shorter than D but taller than C. If someone wants to purchase the tallest doll, which one should they choose?

Abhishek ranked 17th from the top and 49th from the bottom in his class. How many students are there in his class?

In a row of 55 people facing north, Nalini sits 20th from the right end. If Ranjit sits 18th from the left end of the line, how many people sit between Nalini and Ranjit?