A - Although he denies them, Dr. Vasequez faced several scandals last year.
A complex sentences must have both a dependent clasuse (although he denies them) and an independent clause (Dr. Vasquez faced several scandals last year.
Options B and D are compound sentences (two independent clauses) and option C is a simple sentence.
Name an example of wedge. screw. inclined plane. lever. pulley. wheel and axle.
door stop. drill bit. truck loading ramp. nut cracker. crane. door knob.
Answer:
when the tortoise pulls ahead of the hare in the race
Explanation: