1. 

Six students A, B, C, D, E and F are sitting on the ground. A and B belong to Ruby House, while the rest belong to Emerald House. D and F are tall, while others are short. C and D are wearing glasses, while others are not wearing. Which girl of Emerald House is tall and wearing glasses?

A. B
B. C
C. D
D. A

Answer: Option C

Explanation:

We have total six students sitting on the ground : 

Ruby House        ------->   A, B

Emerald House  ------>    C, D, E, F

Tall -------> D, F

Short ------> A, B, C, E

Wearing glasses -------> A, B, E, F

Not Wearing glasses ----> A, B, E, F.

We have to find out the girl of Emerald House who is tall and wearing glasses. So, we have to find out the common students in the given condition. Therefore, D is the only student who is wearing glasses, tall and belongs to Emerald House.