Counting sigma and pi bonds in a small molecule?

1.
The highlighted C atom participates in 4 single bonds. Each single bond consists of a sigma bond. Hence, the highlighted C atom participates in 4 sigma bonds.
The answer: 4

2.
Single bond does not consist of pi bond. Hence, the highlighted C atom participates in no sigma bond.
The answer: 0

3.
The highlighted C atom participates in 4 sigma bonds. Hence, it is sp³ hybridized.
The answer: sp³

There is always one sigma bond connecting any two atoms. So, this molecule has 7 sigma bonds.

Any double bond consists of 1 sigma bond and one pi bond. Since this molecule has one C=O double bond, it has 1 pi bond.

The red C atom has four bonds and so is sp3 hybridized.

I didn't read the question carefully and just assumed everything was about the whole molecule.
The highlighted C atom is involved in 4 sigma bonds (1 to the C and 1 to each H)
The highlighted C atom is not involved in any pi bonds.
The highlighted C atom has 4 bonds from it and so is sp3 hybridized.