f-strings example in Python

Question:
Say you want to display 0.2 kg is the weight of the newt.

You have the following variables:

weight = 0.2
animal = "newt"

How could you do it?

1. f"{weight} kg is the weight of the {animal}."
2. f"{0.2} kg is the weight of the {newt}."
3. f{0.2} kg is the weight of the {animal}.
4. "f{0.2} kg is the weight of the {animal}."

Answer:
A - is the correct answer