Python:

IF THEN | IF THEN ELSE |

ID COMP_OP INT

ID ASSIGN INT

t_COMP_OP= r'==|!=|>=|<=|<|>'

t_ID= r'[a-z]+'

t_ASSIGN= r'='

Valid syntax?

(1) grade > 70

(2) GRADE = 100

(3) grade = 100

(4) if grade >= 70 then grade = 100

(5) if grade >= 70 then if grade < 80 then grade = 75 else grade = 100

Choices for 5 questions above are

(A) yes

(B) No, it contains a lexical error

(C) No, it contains syntax error

Please explain your pick. Thanks.