Other Things Equal, Which One of the Following Factors Would

Other things equal, which one of the following factors would likely NOT contribute to a worsening of the terms of trade of developing countries?

A) heavy reliance on primary product exports
B) the differing price effects of technological change compared to developed countries
C) developing countries' attempts to diversify their exports and to include more Manufactured goods in their export bundle
D) differences in the demand characteristics of the developing countries' exports and Imports