The third sentence down is the right answer. It doesn't use slang.
It's B. pun! It's easy to solve this question by process of elimination. You need to know the definition of each possible answer to know which one is the best choice of all.
Answer:
That student enjoy walking. incorrect
(correction: That student enjoys walking.)
Hiking is one of my favorite activities. correct
The guide shows them the path. correct
Nature teach us lessons. incorrect
(correction: Nature teaches us lessons.)
Some students enjoy the outdoors. correct
The hikers walks the path. incorrect
(correction: The hikers walk the path.)
Answer:
1. Who is Alexander Flemming?
2. What did Flemming study?
3. What chain of events led Flemming to his greatest discovery?
4. How was the first Penicillin tested?
5. How many of the mice given Penicillin survived?
6. What happened in 1945?
