Answer:
B) Ivory
Step-by-step explanation:
England wanted multiple natural resources, but considering the competition, it had to focus on the most important ones. The gold was of great economic value, so it was on top of the list. The coal was still the main source of energy for the industry, so it was also on the desirable list. The rubber was becoming more and more popular because of its properties, practicality, and cheapness, so it too was on the wish list. The ivory though lost its importance. In the past it was very important, but the times have changed and numerous other things have become much more useful and valuable, so it was not a priority.