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Ans. Most of the pteridophytes

Monoecious is a condition in which both male and female reproductive parts are borne on same plant while the dioecious is a condition in which male and female reproductive parts are borne on separate plants.

In pteridophytes, the gametophyte is an individual that bears male and female reproductive organs and hence produces gametes. It may bear both male and female reproductive parts on same plant called monoecious or it may bear male and female reproductive parts on separate plants called dioecious. 

In most pteridophytes, monoecious gametophyte stage is seen. 

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The correct answer is 2) most of pteridophytes.
Monoecious gametophyte means those gametophyte produced from homospores. Homospores can only produce monoecious or both sex containing gametophyte. In ncert pg 38 11th line, it says majority of pteridophytes are homosporous or it means monoecious.

Even most bryophytes are monoecious gametophyte but exception is Marchantia.( see ncert pg 36 , 1st line). It says sex organs are either on the same thalli or on different thalli. So it can be monoecious or dioecious.
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