24) B
The argument made in the text is that drinks with caffeine (which have been banned) can boost the effectiveness of short-term memory, which could help students to recall key information.
We need to identify the statements which can counteract this argument. However, these statements must be linked to each other.
A – 1 and 2
This is wrong. These two statements are not linked to each other and neither of these statements weaken the argument above. They discuss nothing about memory.
B – 1 and 3
Correct. Both these statements are connected by sleep and statement 3 links the lack of sleep with poor memory.
C – 2 and 4
This is wrong. These two statements are not linked to each other and neither of these statements weaken the argument above. They discuss nothing about memory.
D – 3 and 5
This is wrong. These two statements are linked to each other by sleep. However, neither of these statements mention that caffeine causes the sleep deprivation.