<u>Answer:</u>
This is a conversation between Eric and Roberto, in which Eric expresses joy because they are going <u>to take a bath in the lake</u>.
If you are going to swim in a lake, generally you need a bathing suit or swimming suit, which in spanish is translated to <u><em>traje de baño.</em></u>
You won’t need a Jacket (<em>Chaqueta</em>), a sleeping bag (<em>saco de dormir</em>), nor a pair of sandals or flips flops (<em>sandalias</em>), to swim in the lake.
Therefore, the right answer is:
<h2>traje de baño </h2>
Below is the conversation in English:
Eric: It's good that we came to the lake! Now we can take a bath.
Roberto: Oh, no! I forgot to bring my <em><u>swimming suit</u></em>