Option (c) is correct.

The fallacy of Anupsamhari non-exclusive middle term, also known as the fallacy of non-application of the middle term, occurs when a middle term that should be distributed (referring to all members of a class) in order to establish a logical connection between the major and minor terms is not distributed.

In the given statement, the middle term is "knowable." For the argument to be logically valid, the middle term must be distributed in at least one of the premises. However, in option (c), the middle term "knowable" is not distributed, which leads to the fallacy.

In Nyaya philosophy, the nature of existence (eternal or non-eternal) is determined by its knowability. However, the argument in option (c) is flawed because it assumes that all things are non-eternal solely because they are knowable, without considering the possibility of knowable things being eternal.

Therefore, option (c) "All things are non-eternal because they are knowable" involves the fallacy of Anupsamhari non-exclusive middle term.

विकल्प (c) सही है।

न्याय (शास्त्रीय भारतीय तर्कशास्त्र के विचार-सम्प्रदाय) के अनुसार वाक्य “सभी चीजें गैर-शाश्वत है क्योकि वे ज्ञेय हैं, में अनुपसम्हारी (गैर-एकांतिक मध्यवर्ती पद) तर्क–दोष है।