The paragraph is followed by an incomplete phrase or sentence which summarizes the main idea of the paragraph. Choose the missing words of the phrase or sentence.

A growing sector of the population that will certainly require care is the oldest old, those 80 years of age or older. Some have developed strategies for caring for themselves and for each other, and are thus able to receive and give care and support to remain independent and to have control over their own lives.But the percentage of the oldest old is growing very rapidly, and there is an urgent need, particularly in developing countries, to expand care and security networks.
The urgent （） of care for the oldest old.