Numbered Disks Are Placed in a Box and One Disk $\frac { 1 } { 4 }$

Multiple Choice

Numbered disks are placed in a box and one disk is selected at random. If there are 2 red disks numbered 1through 2, and 6 yellow disks numbered 3 through 8, find the probability of selecting a red disk, given that anodd-numbered disk is selected.

A) $\frac { 1 } { 4 }$
B) $\frac { 3 } { 4 }$
C) $\frac { 1 } { 8 }$
D) $\frac { 3 } { 8 }$