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Explanation:

Seminars by students from Economics are scheduled in each of the four slots.
A’s is the only seminar that is scheduled at 10:00 am. A is guided by R.
F is an Anthropology student whose seminar is scheduled at 10:30 am.
The seminar of a Sociology student is scheduled at 9:00 am.

Here, R is an Economics guide, and both his slots should be consecutive. Since there are 4 economics students there must be 2 economics guides.

∴ There must be one more economics guide.

One or R’s slot is at 10 am hence, his next slot will be at 10:30 so that the second economics guide will take the first two consecutive slots.

The seminar of an Economics student, who is guided by T, is also scheduled in the same slot. Therefore, T is the other economics guide who takes the first two slots.

P, who is guiding both B and C, has students scheduled in the first two slots. Also, B is a sociology student.

∴ P is a sociology guide and C is also a sociology student.

B and G are both Sociology students, whose seminars are scheduled in the same slot. 
A and G are scheduled in two consecutive slots.

∴ The only possible case is

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∴ Two seminars are scheduled in the first slot.

Hence, option (d).

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