Step 1: Concept
Calculate the day using odd days from a known reference point or using the day calculation formula.
Step 2: Meaning
2026 is a non-leap year. 2000 has 0 odd days. In 25 years (2001-2025), we have 6 leap years and 19 ordinary years. Odd days = $6(2) + 19(1) = 12 + 19 = 31 \equiv 3$ odd days.
Step 3: Analysis
For 2026, up to Dec 31: ordinary year has 1 odd day. Total odd days = $3 + 1 = 4$.
Step 4: Conclusion
In day coding (0=Sun, 1=Mon... 4=Thu), 4 corresponds to Thursday.
Final Answer: (D)