Though negotiating a fair deal (A) / between the two companies was a (B) / challenging process, and they eventually reached (C) /an agreement that satisfied both (D).

Read the sentence to find out whether there is any grammatical or idiomatic error in it. The error, if any, will be in one part of the sentence. The corresponding letter of that part is the answer. If the given sentence is correct as it is, then choose option ‘No error’ as the answer response. (Ignore errors of punctuation, if any).

The correct option is C.

Explanation:

Let us analyze the structure of the given sentence:

"Though negotiating a fair deal between the two companies was a challenging process, and they eventually reached an agreement that satisfied both."

1. The sentence begins with the subordinating conjunction "Though", which introduces a dependent clause expressing a contrast ("Though negotiating a fair deal between the two companies was a challenging process").

2. A dependent clause starting with "Though" or "Although" must be followed directly by a main/independent clause without adding another coordinating conjunction like "and" or "but".

3. In part (C), the conjunction "and" is redundant and creates a grammatically incorrect structure (a double conjunction/fragment error).

Correction:

To correct the sentence, remove the word "and" from part (C):

"Though negotiating a fair deal between the two companies was a challenging process, they eventually reached an agreement that satisfied both."

Therefore, the grammatical error lies in part (C).