I believe that the problem has been transcribed incorrectly.
Statement 1 should indicate that Rasheed bought not 2 fewer packages but only 1 fewer package, as shown in the following screen shot:



If we know the number of chocolate BARS that were purchased, we can determine the number of chocolate bar PACKAGES that were purchased, since each package contains 2 bars.
Let c = the number of chocolate bars purchased and t = the number of toffee bars purchased.
Question rephrased: What is the value of c?

Statement 1: Rasheed bought 1 fewer package of chocolate bars than toffee bars.
Since each package contains 2 bars, the number of chocolate bars purchased is 2 less than the number of toffee bars purchased.
c = t - 2.
No way to solve for c.
INSUFFICIENT.

Statement 2: Rasheed handed out the same number of each kind of candy bar.
Thus, the 2/3 of the chocolate bars handed out are equal to the 3/5 of the toffee bars handed out:
(2/3)c = (3/5)t.
10c = 9t.
No way to solve for c.
INSUFFICIENT.

Statements combined:
Since we have 2 variables (c and t) and 2 distinct linear equations (c = t-2 and 10c = 9t), we can solve for each variable and thus determine the value of c.
SUFFICIENT.

The correct answer is C.

One way to solve:
c = t-2
9c = 9t - 18
9c + 18 = 9t.

Since 9c + 18 = 9t and 9t = 10c, we get:
9c + 18 = 10c
c = 18.

Since 18 chocolate bars are handed out, and each package contains 2 bars, the number of packages of chocolate bars = 9.