Which of the following words can be formed by adding a prefix to the root word 'form'?

A. TRANSFORM

In a family, there are three generations. X is the grandmother of Y. Y has two siblings, Z and W. W is the son of Y. How is Z related to W?

B. BROTHER

Given the input: 'dog cat mouse bird', if the first step is to swap 'dog' and 'cat', what will be the output?

A. CAT DOG MOUSE BIRD

A cyclist covers a distance of 90 km in 4.5 hours. What is the speed of the cyclist in km/h?

C. 25 KM/H

What is the next letter in the series: M, O, Q, S, ?

B. T