Step 1: Build a small table of the two features for every filled cell.
Row 1: (dip, bent legs), (flat, tripod legs), (dome, fan legs).
Row 2: (flat, fan legs), (dome, tripod legs), (dip, bent legs).
Row 3: (dome, fan legs), (dip, bent legs), (?, ?).
Step 2: Use the row rule to find the missing body shape.
Every row must contain one flat body, one dome body and one dip body, since that is the pattern set by rows 1 and 2. Row 3 already has dome and dip, so the missing body shape for row 3 must be flat.
Step 3: Use the row rule to find the missing leg style.
Every row must also contain one fan-leg figure, one bent-leg figure and one tripod-leg figure. Row 3 already has fan legs and bent legs, so the missing leg style is the plain tripod.
Step 4: Cross-check using the columns instead of the rows.
Column 3 currently holds dome-plus-fan-legs and dip-plus-bent-legs. Column 3 is missing a flat body and tripod legs too, exactly the same two features found from the row check. Since both checks agree, the answer is confirmed rather than a coincidence.
Step 5: Pick the option that matches flat body and tripod legs.
Scanning the six numbered options, image 5 is the one with a flat, straight body line and three evenly spread straight legs. The other options either have the wrong body curve, the wrong leg style, or both.
Final Answer:
Both the row check and the column check point to the same combination, flat body with tripod legs, which is image 5.
\[ \boxed{5} \]