Using から with short/informal writing


My question is about using から when writing short form/informal speech in a
sentence ending in a verb. For example, if the formal version is:

A「猫はちょっと太っていますね。」  
B「ええ、よく食べますから。」

Would the informal/short version of Speaker B's part be written:

うん、よく食べるから。  
Or:  
うん、よく食べるだから。

Or some other way?

(This is for an assignment where we take a written long form/formal
conversation and rewrite it as informal/short speech.)




だから = だ (casual copula) + から (because)

だから is basically the casual form of ですから. You can't use です with a verb in ます
form, so ですから wouldn't work in the formal version and だから wouldn't work in the
casual version since だ is the copula and you already have a verb - 食べる.

