English grammar error-spotting (terminology, agreement, and relative clause tense in a technical sentence): Identify the single erroneous segment among A–D; select ‘‘No error’’ only if all parts are correct. Focus on expansion of ‘‘OTC’’, subject–verb agreement with ‘‘divisions’’, and verb form in the relative clause: ‘‘Another reason for pharmaceutical companies beefing up their / OTC (Over the Country) divisions is that prescription drugs with proven safety records which have been reached / the end of the their patent protection periodare / allowed to be sold without a prescription. No error’

Given data (errors concentrated in Part B)

• Wrong expansion of OTC: written as ‘‘Over the Country’’ (should be ‘‘Over-the-Counter’’).
• Agreement clash: ‘‘divisions is’’ should read ‘‘divisions are’’ because ‘‘divisions’’ is plural.
• Malformed relative verb: ‘‘which have been reached’’ is ungrammatical; correct is ‘‘which have reached’’ (active voice), or ‘‘that have reached’’.

Core corrections to Part B
‘‘OTC (Over-the-Counter) divisions are … ‘‘prescription drugs … ‘‘which have reached’’ …’’

Notes on other parts (for awareness only)
Part C also contains issues (‘‘the their’’ → ‘‘their’’, missing space ‘‘period are’’), but the test's marked error segment is Part B. In comprehensive editing, we would fix C as well.

Corrected version (illustrative)
‘‘Another reason for pharmaceutical companies beefing up their OTC (Over-the-Counter) divisions are that prescription drugs with proven safety records that have reached the end of their patent-protection period are allowed to be sold without a prescription.’’

Common pitfalls

• Mishandling technical abbreviations.
• Letting a plural subject take a singular verb.
• Overusing passive ‘‘have been reached’’ where active is required.

Final Answer
OTC (Over the Country) divisions is that prescription drugs with proven safety records which have been reached