Question

before a giant molecular cloud stars forming stars, its temperature is
already thousands of degrees (hot)
already millions of degrees (very hot)
astronomers dont know its starting temperature
actually very cold

Explanation:

Giant Molecular Clouds (GMCs) are cold, dense regions in space. Before star - formation begins within a GMC, the cloud is in a relatively stable state. The low temperatures (typically a few tens of Kelvin) are due to the fact that the cloud is not yet undergoing the gravitational collapse and heating processes associated with star formation. High temperatures (thousands or millions of degrees) are characteristic of the later stages of star formation (e.g., in protostars or during nuclear fusion in stars), not the pre - star - formation state of the GMC. Astronomers do have a general understanding of the physical conditions (including temperature) in GMCs through observations (e.g., using radio telescopes to detect molecular line emissions which can be related to temperature).

Answer:

actually very cold