Write a sequence of statements that finds the first comma in the string associated with the variable line, and associates the variable clause the portion of line up to, but not including the comma. you may assume that an int variable pos, as well as the variables line and clause, have already been declared.

As given in the question assuming that the necessary variable are declared, the below line would satisfy the expectation of the question.

     clause = line.split(',')[0]

Explanation:

Split is string function which enable us split the text based on the character that is given as a parameter. Split() accepts a single parameter which accepts the splitter character.

According to the question the given string should be separated by comma and the first sentence before comma should be assigned to the clause variable. So line.split(‘,’)[0] will do that.

The number ‘0’ inside the square bracket represent the first sentence after splitting with comma.  

these  signals travel  down a part of the neuron called the axon, which is like a wire that carries the  signal  to othernerve  cells. on average a  nerve  cell sends a  signal  at about 50 meters per second, which is over 100  miles  an hour!