ANSWER
[tex]D. \: \: 96\degree[/tex]
EXPLANATION
The measure of angle ABC is 48°.
Angle about the center is twice the angle about the edge.
The measure of angle ADC is twice the measure of angle ABC.
This implies that,
[tex]m \: < \: ADC=2(m \: < \: ABC)[/tex]
We substitute to obtain,
[tex]m \: < \: ADC=2(48 \degree)[/tex]
We simplify to get,
[tex]m \: < \: ADC=96 \degree[/tex]
Hence the measure of arc AC is 96°.
Therefore the correct answer is option D.