To decode the words for 'sun' and 'brightly', analyze the given sentences and their translations:
Step 1: Identify common words in sentences and their translations. The word 'brightly' appears in both Sentence (A) and Sentence (B). The common code in those translations is 'ba'. Therefore, 'brightly' is encoded as 'ba'.
Step 2: Identify the code for 'sun'. The word 'sun' appears in Sentence (A) and Sentence (C). The common code here is 'lo'. Thus, 'sun' is encoded as 'lo'.
Therefore, the words 'sun' and 'brightly' are written as 'lo' and 'ba' respectively, matching the correct answer 'lo, ba'.