Among the many reasons for his defeat in the election was his arrogant assumption that his constituents were incapable of understanding economic conditions, and his unwarranted attack on his chief opponent.

• A. was his arrogant assumption that his constituents were incapable of understanding economic conditions
• B. were his arrogant assumption that his constituents were incapable of understanding economic conditions
• C. were his arrogant assumptions that his constituents were incapable of understanding economical conditions
• D. were his arrogant assumption that his constituents would be incapable of understanding economics