Which of the Following Is the Proper Accounting Treatment for Research

Which of the following is the proper accounting treatment for research and development costs?

A) Research and development costs must be capitalised and amortised over 20 years or less.
B) Research and development costs must be capitalised and amortised over 70 years or less.
C) Research and development costs must be capitalised and expensed each year to the extent that their value has declined.
D) Research costs must be expensed and development costs may be capitalised in limited circumstances.