Step 1: 4x + 5 < 6x + 1 (Given)

Step 2: −2x + 5 < 1 (Subtraction)
Step 3: −2x < 6 (Addition)
Step 4: x > −3 (Division)

Mia is trying to find her mistake in the problem shown. In which step did she first make a mistake
A Step 1
B Step 2
C Step 3
D Step 4

Mia made the mistake in Step 3.

In Step 2, she correctly subtracted 6x from both sides of the equation to get -2x + 5 < 1.

However, in Step 3, she incorrectly added 6 to both sides of the inequality, which gives -2x < 6. This is incorrect because she should have subtracted 5 from both sides of the inequality.

Therefore, the answer is C) Step 3.