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The massive star-forming region W75N~(B) is thought to host a cluster ofmassive protostars (VLA~1, VLA~2, and VLA~3) undergoing different evolutionarystages. In this work, we present radio continuum data with the highestsensitivity and angular resolution obtained to date in this region, using theVLA-A and covering a wide range of frequencies (4-48~GHz), which allowed us tostudy the morphology and the nature of the emission of the different radiocontinuum sources. We also performed complementary studies with multi-epoch VLAdata and ALMA archive data at 1.3 mm wavelength. We find that VLA~1 is drivinga thermal radio jet at scales of $\approx$0.1 arcsec ($\approx$130 au), butalso shows signs of an incipient hyper-compact HII region at scales of$\lesssim$ 1 arcsec ($\lesssim$ 1300~au). VLA~3 is also driving a thermal radiojet at scales of a few tenths of arcsec (few hundred of au). We conclude thatthis jet is shock-exciting the radio continuum sources Bc and VLA~4 (obscuredHH objects), which show proper motions moving outward from VLA~3 at velocitiesof $\approx$112--118~km/s. We have also detected three new weak radio continuumsources, two of them associated with millimeter continuum cores observed withALMA, suggesting that these two sources are also embedded YSOs in this massivestar-forming region.

Characterizing the radio continuum nature of sources in the massive star-forming region W75N (B)