QUESTION: If "A young blond-haired white woman holds a tennis racket in a stadium." does that mean that "A young blonde lady was playing tennis at the stadium."?
Options:
- yes
- it is not possible to tell
- no

Let's solve it slowly: Playing tennis tells what the woman was doing when she holds a tennis racket.
The answer is yes.

QUESTION: If "The kid is on a float in the snow." does that mean that "A kid is sitting on a float on top of snow outside."?
Options:
- yes
- it is not possible to tell
- no

Let's solve it slowly: One on a float is not necessarily in form of sitting.
The answer is it is not possible to tell.

QUESTION: Premise: "A smiling post office worker proudly shows off his four wheeled mailbag carrier."
Hypothesis: "A snarling postal worker throws his mailbag across the room."
Do we know that the hypothesis entailed by the premise?

Let's solve it slowly:
The worker that proudly shows off his four wheeled mailbag carrier cannot be the same that throws it across the room.
The answer is no.