The correct option is A MCXI
Step 1: Write the number in expanded form.
1111 = 1000 + 100 + 10 + 1
Step 2: Write the expanded numbers as Roman numerals and bring them together.
1111 = 1000 + 100 + 10 + 1
= M + C + X + I
= MCXI
Hence, 1111 written in Roman numerals is MCXI.