Suppose a Consumer Has an Income Equal to I Which $\mathrm { P } _ { \mathrm { f } }$

Suppose a consumer has an income equal to I which he/she spends on either food or clothing. The price of food is given by $\mathrm { P } _ { \mathrm { f } }$ and the price of clothing is given by $\mathrm { P } _ { \mathrm { c } }$ . If the consumer spends all of his/her income on clothing, the expression for the number of units of clothing he/she buys is:

A) $\mathrm { I } / \mathbf { P } _ { \mathrm { f } }$
B) $I x P _ { c }$
C) $\mathrm { I } / \mathrm { P } _ { \mathrm { c } }$
D) $\mathrm { I }$