Why is the answer 2-ethyl-4,5-dimethylheptane instead of my answer?

[toothpaste666]

Homework Statement

The Attempt at a Solution

The answer is supposed to be D but I can't figure out why, my method gave me B
counting the number of points in the longest chain there are 7 and there are only single bonds so without the branches I have heptane. there is a ethyl attached to the second point and a methyl attached to the fourth and fifth point so it should be 2-ethyl-4,5-dimethylheptane

 

[mfb]

The longest chain follows the "upwards branch" and has 8 atoms.

 

[toothpaste666]

i get it now. thank you

 

[DrClaude]

The correct answer is C.

 

[toothpaste666]

woops that was a typo in the original post. The answer key has it listed as C