Concept:
Word-formation logic involves checking if the letters required for a new word are present in the "mother" word in sufficient quantities. If even one letter in the option is missing from the mother word, that option cannot be formed.
Step 1: Inventory of letters in CIRCUMSTANCE.
Let's list the available letters:
C (2), I (1), R (1), U (1), M (1), S (1), T (1), A (1), N (1), E (1)
Step 2: Evaluation of the options.
• Meant: Contains M, E, A, N, T. All are present.
• Circus: Contains C (2), I, R, U, S. All are present.
• Stair: Contains S, T, A, I, R. All are present.
Step 3: Identification of the missing letters.
Let's look at the word "straight":
S, T, R, A, I, G, H, T
The letters 'G' and 'H' do not appear anywhere in the word CIRCUMSTANCE. Therefore, "straight" cannot be formed using the provided letters.
Final Answer: Option D