A hug is an act in which two people express affection for one another by wrapping their arms around each other.
This justifies what answer for what question? Q & A: 
One of the following sentences is nonsensical. Which one is it?
Options:
- Sentence A: "A kiss is an act in which two people express affection for one another by pressing their lips together"
- Sentence B: "A hug is an act in which two people express affection for one another by pressing their lips together"

Sentence B
A hug is an act in which two people express affection for one another by wrapping their arms around each other.
This justifies what answer for what question? Q & A: 
user
One of the following sentences is nonsensical. Which one is it?
Options:
- Sentence A: "A kiss is an act in which two people express affection for one another by pressing their lips together"
- Sentence B: "A hug is an act in which two people express affection for one another by pressing their lips together"

Sentence B
assistant
A hug is an act in which two people express affection for one another by wrapping their arms around each other.
This justifies what answer for what question? Q & A: 
One of the following sentences is nonsensical. Which one is it?
Options:
- Sentence A: "A kiss is an act in which two people express affection for one another by pressing their lips together"
- Sentence B: "A hug is an act in which two people express affection for one another by pressing their lips together"

Sentence B