Which of the French phrases pas manger de and la is correct?

Neither "pas manger de" nor "la" are correct French phrases on their own. You need more context to understand what you're trying to say.

Here's why and some possible solutions:

* "Pas manger de" is grammatically incorrect. "Pas" means "not" and "manger" means "to eat," but "de" is missing a noun. You need a noun after "de" to make sense.

* "La" is the feminine singular definite article, meaning "the." It's not a complete phrase, just a word.

To help me understand what you're trying to say, please give me more context:

* What are you trying to say? For example, "I don't eat..." or "The ..."

* What is the object you are referring to? For example, "bread," "cheese," "girl," etc.

Here are some examples of how you might use these words correctly:

* "Je ne mange pas de pain." (I don't eat bread.)

* "La fille est belle." (The girl is beautiful.)

Please provide more information so I can help you construct the correct French phrase.