Question

a coworker brings you a bag of oatmeal in which he has found black specks. what is the most likely cause of those specks?
the bag was left open and dirt and/or dust has settled on the oatmeal.
the supplier’s bulk bins have not been cleaned, and rust has built up in them.
pests have entered the bag and left waste secretions in the oatmeal.
oatmeal usually has black spots on the flakes, so the cause is natural.

Explanation:

To determine the most likely cause of black specks in oatmeal, we analyze each option:

• Option 1 (the bag was left open...): Dust/dirt from an open bag would be more random debris, not typical black specks on oatmeal flakes.
• Option 2 (suppliers' bulk bins...): Rust from bins would not appear as specks on oatmeal flakes in a typical way related to oatmeal's natural state.
• Option 3 (pests have entered...): Pest waste or infestation would be an external contamination, not a natural characteristic of oatmeal.
• Option 4 (Oatmeal usually has black spots...): Oatmeal (especially certain types or due to natural variations in the grain) can have natural black specks as part of its composition, making this the most likely natural cause.

Answer:

The option with "Oatmeal usually has black spots on the flakes, so the cause is natural." (the fourth option, assuming the first option is "the bag was left open...", second "the suppliers' bulk bins...", third "pests have entered...", fourth as described).