Step 1: Read the relationship in the first pair.
A ceiling fan sits at the top of a room and a table fan sits at the bottom. The pair stands for two things placed at opposite ends of the same space.
Step 2: Apply that same opposite idea to the letter string.
The string abcdefg is written in forward order. Its opposite is the same seven letters written in reverse order, back to front.
Step 3: Reverse the string letter by letter.
Reading abcdefg from the last letter to the first gives g, f, e, d, c, b, a, so the string becomes gfedcba.
Step 4: Check the other options.
Option A keeps the string unchanged, so it shows no opposite relation. Option B only swaps the last three letters and leaves the rest forward, a partial reversal, not a full one. Since a full reversal exists, option D is wrong too.
Final Answer:
gfedcba is the complete reverse of abcdefg, so option C is correct.