Asequence is:
a) an arrangement of quantities whose positions are based upon the natural numbers
b) any list of numbers
c) a summation of quantities whose positions are based upon the natural numbers

Option a) is correct.

Step-by-step explanation:

we have to choose the best definition for the given term i.e sequence.

As, a sequence is an enumerated collection of objects in which repetitions are allowed. A sequence is a set of numbers, called terms, arranged in some particular order. Like a set, it contains members

A sequence is an ordered list of numbers.

Sequence is an ordered list of numbers and series is the sum of a list of numbers.

Example: A sequence of odd natural number

1,3,5,7,

Hence, option a)

A sequence is an arrangement of quantities whose positions are based upon the natural numbers