Final answer:
According to Acts 1:15, the believers were a multitude of about 120, which included the apostles and other followers, forming the early Christian community.
Step-by-step explanation:
According to Acts 1:15, the believers were d) A multitude of about 120. This group consisted not only of Jesus's original disciples, also known as apostles, but also other followers who adhered to his teachings and spread his message. The apostles, including the twelve, were among this larger group of early Christians
After Jesus's resurrection and ascension into heaven, his followers, led by these apostles, began to spread the teachings and message of Jesus. They referred to him as "the Christ", meaning "the anointed one" or "messiah", which implies that they believed Jesus was anointed to provide salvation for humanity.
Eventually, these early followers formed the foundation of what we now know as Christianity.