Probability is:
a. the measure of how likely an event is to occur.
b. the ratio of total possible outcomes to desired outcomes.
c. not conveyed as a decimal or a percent.
d. none of the above.

Option a) The measure of how likely an event is to occur.      

Step-by-step explanation:

We define probability of an event as:

It tells us how likely the event is to occur.Mathematically, it is defined as

It ranges from 0 to 1.An event with probability with 0 probability is impossible event and an event with probability 1 is sure event.Probability of an event can never be negative.It can be conveyed in decimals and percentages.It tells us how often a event will happen.Thus, the correct interpretation for probability is :

Option a) The measure of how likely an event is to occur.

Um what? rephrase that ?