The second Choice because it makes more sense
So first you would want to round the numbers to the nearest tenth.
243.9 + 132.4= 376.3
Large is an Adjective
Fish is a Noun
Swim is a Verb
Swiftly is an Adverb
In is a preposition
The is a determiner
Sea is a noun.
I hope this helps since you didn't say which word is italicized.